Crosman 2289/13xx Forearm Pops Open

[Rick67]

You can use 2 washers depending on the thickness, then just lap to fit.

Got the idea from Mudduck of the CAPOF 👍

[Moke]

That pivot point was chewed up pretty bad, to an oval shape. So, i did not recognize that the hole is just two halves of  punch press holes that perfectly aligned to each other to create a thru-hole. 
So, I inserted a screw driver blade, and tried to move that "hole" as I thought it might just be an insert. That made the hole even more ragged before I realized that it was two aligned punched sections pressing together.
So I fired up my angle grinder and cut-off blade, and I reached between the two "tangs" and cutaway the punched thru-hole, and ground off the now two nipples. I ground them back to flush, and inserted the silver disc to a perfect fit.
I also used a thin nylon flat washer between the wall of the barrel band, and the steel pump mechanism, to shore up that side to side slop thing.
The barrel band got a new stainless allen cap screw and nylon lock nut, rather than that construction screw like thing that was stock.

[Moke]

thanks again, all!

[avator]

I try not to tell people what they should and should not do with their guns but this is one of the results of over pumping these guns. Sure, they will eventually wear under normal use but over pumping drastically speeds up the failure.

[Moke]

This is just a result of thousands and thousands of pumps that I never took it beyond 10 pumps in a single shot. But I did those ten pumps, many, many thousands of times.
I did recently suggest going to 15 pumps after installing the flat valve, but, that was just in testing the forearm steadiness. And when I shot it, my wife said that it was far louder, which is something that I do not desire.

[avator]

This is just a result of thousands and thousands of pumps that I never took it beyond 10 pumps in a single shot. But I did those ten pumps, many, many thousands of times.
I did recently suggest going to 15 pumps after installing the flat valve, but, that was just in testing the forearm steadiness. And when I shot it, my wife said that it was far louder, which is something that I do not desire.

Mike, my reply was very general. In no way was I suggesting or accusing you of over pumping. But yeah, as with most things mechanical, they even wear with normal use.

[Rick67]

This is just a result of thousands and thousands of pumps that I never took it beyond 10 pumps in a single shot. But I did those ten pumps, many, many thousands of times.
I did recently suggest going to 15 pumps after installing the flat valve, but, that was just in testing the forearm steadiness. And when I shot it, my wife said that it was far louder, which is something that I do not desire.

You could also reinforce your valve with a set screw on top, especially now that you have a flat top (I’ll look for that thread).

I copied Wyoman’s mod years ago with my Crosman pistols.

Here’s another reinforcement but this one is to the metal barrel band:



https://www.gatewaytoairguns.org/GTA/index.php?topic=139287.0

[Rick67]

This is just a result of thousands and thousands of pumps that I never took it beyond 10 pumps in a single shot. But I did those ten pumps, many, many thousands of times.
I did recently suggest going to 15 pumps after installing the flat valve, but, that was just in testing the forearm steadiness. And when I shot it, my wife said that it was far louder, which is something that I do not desire.

You could also reinforce your valve with a set screw on top, especially now that you have a flat top (I’ll look for that thread).

I copied Wyoman’s mod years ago with my Crosman pistols.

Here’s another reinforcement but this one is to the metal barrel band:



https://www.gatewaytoairguns.org/GTA/index.php?topic=139287.0

13xx valve pinning that also works on 22xx C02 guns:

https://www.gatewaytoairguns.org/GTA/index.php?topic=185793.0


Wyoman’s a genius and a great builder, yes sir 👍

[WobblyHand]

Would be nice if the area in question were reinforced (somehow).  The fact that the pivot hole wore out means it was under designed.  Or the manual didn't give the correct number of maximum pumps.  It's obvious that the tougher the pumping is, the more it pushes on that hole.  So the max pumps specification should have been reduced - at least in the owner's manual.  Now most of us won't pay attention, but, at least we were warned.  If that folded sheet metal was 10-15% thicker, I'd bet it would last longer.  Or maybe one could install a larger diameter bushing to spread out the load below deformation.

[avator]

Or replace it with a solid billet arm.   

[Rick67]

Or replace it with a solid billet arm.   

I did see one years ago but could not recall if it was for the 13xx or the 2100 🤔

[avator]

I'm sure a few of our talented members could make them.

[WobblyHand]

Can't claim any machining talent, but that would be the sort of thing that I'd try for the heck of it.  I don't have a stock pile of LEGO parts, and who knows how long they will remain available.  Might have to try some time.  I've certainly had mine apart enough times.

[avator]

I feel very lucky to have been dropped into the timeline precisely at the time of the Crosman "lego" era. I fear it's time is coming to an end.
It may be a wise move to do some research and hoard up on what may be still available if the plan is to continue enjoying them for years to come.
Yeah, there were many sold and there are a butt load of them out there but the parts that fail/wear are common and it won't be much joy with buying used ones to repair your broken ones.
Aftermarket will dictate the longevity.

[Moke]

So, yesterday, after looking at the grip of my 2289, and the liberal application of electrical tape to the grip to steady it as a real handle, I finally decided to screw mount the grip to the metal pistol handle frame.
I love how Crosman put the crosshairs at where you needed to drill, and that they pre-threaded the thru-hole to 6-32.  I even confirmed it with electrical switch plate screws, perfect. 
So, I run off to the hardware store, and buy the perfect screws, and,...
I hand tightened them to a point of needing an allen wrench to finish, and guess what?
Immediately on tightening, the pot metal of the frame just crumbled and fractured away.  And not enough thread was left to get a single side seated.
This meant drilling the whole hole out, and, rethinking how to get a pair of screws into that space,.... Corby bolts! (screws that have both *nut and bolt looking like male screws)
Do you think that I could find a Corby bolt in northern San Diego, or even southern Riverside counties? nope!
I found something similar, and it will work until I can track down a real Corby bolt.

* How do you tell a nut from a bolt at the hardware store?
Men are bolts, and, women are nuts

[WobblyHand]

So, yesterday, after looking at the grip of my 2289, and the liberal application of electrical tape to the grip to steady it as a real handle, I finally decided to screw mount the grip to the metal pistol handle frame.
I love how Crosman put the crosshairs at where you needed to drill, and that they pre-threaded the thru-hole to 6-32.  I even confirmed it with electrical switch plate screws, perfect. 
So, I run off to the hardware store, and buy the perfect screws, and,...
I hand tightened them to a point of needing an allen wrench to finish, and guess what?
Immediately on tightening, the pot metal of the frame just crumbled and fractured away.  And not enough thread was left to get a single side seated.
This meant drilling the whole hole out, and, rethinking how to get a pair of screws into that space,.... Corby bolts! (screws that have both *nut and bolt looking like male screws)
Do you think that I could find a Corby bolt in northern San Diego, or even southern Riverside counties? nope!
I found something similar, and it will work until I can track down a real Corby bolt.

* How do you tell a nut from a bolt at the hardware store?
Men are bolts, and, women are nuts

Next time, I recommend using a tap to thread the holes. 

[Moke]

The metal frame hole was already threaded at the factory.  I tried a wall plate screw (matching 6-32 thread), and it cleared smoothly and cleanly all the way through.  I got the fracturing of the cast pot metal threaded hole on the first and slightest compression/hesitation while tightening; emphasis: slightest.

[Moke]

I ordered a new forearm pump links mechanism yesterday.

[Rick67]

I like the way Vernon Austin attaches his laminate/wood pump arms onto the linkage: he drills and taps the bottom, so there are no side holes. It’s actually more solid. He also embeds dampers to make it very quiet.

I haven’t used my pumpers in a long time though 🤔