You have to install a small flat washer in between the two halves of the pump arm to get rid of the backpacker pump arm slop. I measured the gap in the barrel band and the width of the pump arm. Then found a thin flat washer, sanded it off a little. Now no more slop.
Good idea! :-*
If you get one of the MellonAir solid pins they come with a nice aluminum washer for the same purpose.
http://mellonair.com/index.php?p=1_12_Solid-Pins (http://mellonair.com/index.php?p=1_12_Solid-Pins)
Carl
I see her Mr. Mud she is comfy alright. Thanks and best regards :-*
Also, when you buy the Blue Fork barrel band, it comes with a steel pin to replace the roll pin. Just no washer.
Quote from: mudduck48 on March 25, 2013, 06:09:33 PM
Also, when you buy the Blue Fork barrel band, it comes with a steel pin to replace the roll pin. Just no washer.
Copy that sir 8)
:-* Good deal duck :-*
I think your mod will work better than the Mellon gizmo because you're separating the tines at the pivot hole :-*
the Mellon device fits over the pivot and is alittle loose
Did you use a washer with a 3/16" ID ?
I'm going to try this because you can cut the washer thickness for perfect fit....I like this alot duck :-* :-*
Quote from: WyoMan on March 26, 2013, 02:23:38 AM
I think your mod will work better than the Mellon gizmo because you're separating the tines at the pivot hole :-*
the Mellon device fits over the pivot and is alittle loose
Did you use a washer with a 3/16" ID ?
I'm going to try this because you can cut the washer thickness for perfect fit....I like this alot duck :-* :-*
I think the ID would depend on the pin your are using. I used a steel pin from a 1377 phaze 2, you know , the one with the C clip. I did have to drill out the hole a little. I measured the barrel band inside width and the pump arm width, then sanded the washer thickness to give the pump arm about 3 thou clearence when installed. If I remember right, I needed the washer to be 15thou thick. But don't quote me.LOL. I just noticed that the stock 1377 pump arm did not have slop. When I installed the longer barrel on my 1322 with the stock 2289 backpacker barrel band, now I had slop, side to side. When I installed my Blue Fork barrel band, I wanted to get rid of the slop.
I'm going to have to check my Backpacker when I get home and see if it has that slop. Like you mentioned, my 1377s appeared to be pretty tight as they came from the factory. Wonder if it has anything to do with the different forearms?
Carl
Quote from: quickster47 on March 26, 2013, 01:27:18 PM
I'm going to have to check my Backpacker when I get home and see if it has that slop. Like you mentioned, my 1377s appeared to be pretty tight as they came from the factory. Wonder if it has anything to do with the different forearms?
Carl
Carl, it' not the forearms. It's the barrel band. I measured the stock barrel band from my stock 1322 and it measured .230 inside. Then I measured the stock 2289 backpacker barrel band and it was .260. The Blue Fork also measured .260. That is where the side to side slop comes from, the barrel band. The one on the left is the stock 1322 and the one the right is the stock 2289 barrel band.
Ah ha, now that sort of makes sense. I have several of both types you show in your picture but both of after-market bands are mounted on guns. Will still check mine when I get home. Good find.
Carl
Quote from: mudduck48 on March 25, 2013, 05:02:01 PM
You have to install a small flat washer in between the two halves of the pump arm to get rid of the backpacker pump arm slop. I measured the gap in the barrel band and the width of the pump arm. Then found a thin flat washer, sanded it off a little. Now no more slop.
Mr. Mud I am still waiting for HPA's reply..Asked him about the availability of the unsighted version black BF bb and so far the answer is just an electronic response..I want it shipped to the Phils. direct by registered mail and not to Kansas because my boxes there will take a boat trip it will be a month or a month and a half for my assorted items to arrive by boat..Best regards.
Btw this barrel band looks nice and is not too complicated to copy I think..
(http://i6.photobucket.com/albums/y212/Larry59/Bands/1377BrassBandCloseup1.jpg)
(http://i6.photobucket.com/albums/y212/Larry59/Bands/1377BarrelBand.jpg)
Good idea and good drawing Mister C. Thanks for posting that.
Shouldn't be too hard to make one of those in brass or aluminum or even stainless if one is feeling lucky.
Carl
Mr. Mudduck kindly check this out..I used a stainless washer on mine and yes it is indeed a very effective slop killer :-* Mine seems to be thinner than yours I lapped it and because I am now using a ss plug on my 1377 and the duo are a perfect mate. I have about a dozen washers and some that are thicker than this and are too tight this one is just right 8). I disassembled it again tonight because I have decided to wait for the Ballistol and the Ezzox and lube them w/ it..I also installed two o-rings on the piston on each side like you do when you shim a trigger/sear. Awesome difference yes sir :-* Best regards.
(http://i709.photobucket.com/albums/ww96/DARKHORSE1967/IMG_0411_zpsfa5c2843.jpg)
(http://i709.photobucket.com/albums/ww96/DARKHORSE1967/IMG_0412_zps22239b5a.jpg)
(http://i709.photobucket.com/albums/ww96/DARKHORSE1967/IMG_0410_zps1360e117.jpg)
Mister Crossliner, did you happen to measure the thickness of the washer after you finished lapping it? I know each gun will be a little different but would like to get a starting point.
Carl
Hi Mr. Q the ss washer on mine post lapping is .53 mm..It seems that that pivot plug is a tighter fit than the MC/BF 1377 barrel band but I could be mistaken because I do not have 1 to compare it to..Mr. Mudduck's seems much thicker than mine hence my assumption..I tried .82, .7 and .6 something but they were already too tight. Best regards.
Thanks much Mister C. I have a good assortment of SS shims and going to give it a try to tighten up the slop in mine and Julie's 1377 shooters.
Carl
While I am on it I would also like to put two shims on the lever (the one that joins the pump arm and the piston) probably lapped c-clips.. That pin right there is peened so I guess I have to have it removed it if I do shim it. I have already put two o-rings as shims on the piston so it's much more centered now. Best regards.
(http://ecx.images-amazon.com/images/I/51yyLwbNN0L.jpg)
Quote from: quickster47 on April 14, 2013, 02:50:08 PM
Thanks much Mister C. I have a good assortment of SS shims and going to give it a try to tighten up the slop in mine and Julie's 1377 shooters.
Carl
Well we have our own Herr Mudduck to give our thanks to sir :-* Believe me it really works Mr. Q. Even before I o-ringed my piston it was already giving me a very solid feel..This mod might be too harsh on a plastic band though and might wreck havoc on an anodized aftermarket one because it will rub on the milled walls already ??? The pivot plug on mine is 304 ss so I have no worries. Best regards.
I'll be adding a washer too next time I knock out the roll pin. My 1377 with a 760 BB is really loose too.
Thanks for starting the thread and for everyone's good tips in here.
I took one of these..
(http://i789.photobucket.com/albums/yy172/baltim0re28/E2FB5322-425C-479C-8B0A-B78DA6057B65-31949-00002DA064B05145_zpsd1dd3930.jpg)
And put it on the one side and it took all of the "wiggle" out. You can see it at the bottom of the picture. I've been using it with the plastic barrel band for about 2 weeks with ALOT of pumping in that time frame with NO problems. (http://i789.photobucket.com/albums/yy172/baltim0re28/34CF9118-A55A-467F-8B37-8FAF13EE91FF-31949-00002DA2059DCD9E_zps391fdf1b.jpg)
They are Teflon washers used to shim wheel bearings in RC cars, so they are made to withstand a massive amount of friction. I just used a little moly. Available at almost every hobby shop around and readily available online :-*
Thanks Brent, good stuff.
Quote from: crossliner on April 14, 2013, 03:04:06 PM
Well we have our own Herr Mudduck to give our thanks to sir :-* Believe me it really works Mr. Q. Even before I o-ringed my piston it was already giving me a very solid feel..This mod might be too harsh on a plastic band though and might wreck havoc on an anodized aftermarket one because it will rub on the milled walls already ??? The pivot plug on mine is 304 ss so I have no worries. Best regards.
Well, thank you, thank you. I try to come up with something once in a while. But , this works. Thank you again. QUACK, QUACK!
So simple a mod and yet so effective Mr. Mudduck :-* Best regards.
Quote from: Baltim0re28 on April 14, 2013, 08:28:14 PM
I took one of these..
(http://i789.photobucket.com/albums/yy172/baltim0re28/E2FB5322-425C-479C-8B0A-B78DA6057B65-31949-00002DA064B05145_zpsd1dd3930.jpg)
And put it on the one side and it took all of the "wiggle" out. You can see it at the bottom of the picture. I've been using it with the plastic barrel band for about 2 weeks with ALOT of pumping in that time frame with NO problems. (http://i789.photobucket.com/albums/yy172/baltim0re28/34CF9118-A55A-467F-8B37-8FAF13EE91FF-31949-00002DA2059DCD9E_zps391fdf1b.jpg)
They are Teflon washers used to shim wheel bearings in RC cars, so they are made to withstand a massive amount of friction. I just used a little moly. Available at almost every hobby shop around and readily available online :-*
I like that idea for my plastic barrel band... good idea!! Thanks!!
i thought the washer thing mellon includes was to help keep the pump lever hole from stretching too much
mr mellon if you are still cruising capof can you enlighten us or if someone has asked him shed some light on this please
Here is another one that needs to be put out again for the new people we have. The pump arm shim washer. I takes up the side to side slop when you mod the pumpers. :-*
:-*
:-* I recently read through this one.
When I did this, I had the Bluefork barrel band on my 1322. When I went to Davio's barrel band, I eliminated the washer. His barrel band is made in a way that tightens up the slop. No need for the washer. And it tightened up my groups. ;)
http://www.ebay.com/itm/Super-Rigid-BackPacker-Barrel-Band-for-Crosman-2389-1322-1377-w-longer-bbl-/301314789216?hash=item4627c2cf60:g:GDYAAOSwq7JUFp5X (http://www.ebay.com/itm/Super-Rigid-BackPacker-Barrel-Band-for-Crosman-2389-1322-1377-w-longer-bbl-/301314789216?hash=item4627c2cf60:g:GDYAAOSwq7JUFp5X)
Thanks for that info about Davio's BB. I'm sure I'll get one at some point. I'm attempting a free float first, but if that doesn't work....