These pictures and notes show my progress, lack or progress and final success in resealing the 105…over the course of a month!
The valve assembly. I figured an o-ring would work for sealing the valve body in the pistol. Unfortunately the pistol leaked. So I spent some time trying to figure out the problem…I removed the brass cup that the valve spring fit in as I couldn't find it on the parts list.
This worked well, so I’ll have to try this in the future. The 80 durometer, being softer than the 90 durometer of the first seals, seemed to work much better. But the pump was not pushing much air into the valve…
I decided to use a modified Crosman 1377 pump cup. I’ve shown that several times on the blog. I turned down an old button head cap screw for the retaining screw as the cup is shorter than the cup used on the 105 originally.
Finally…I noticed that Derrick said the bolt on the 116 is supposed to have tiny balls between the bolt spring and the ID of the breech, and the 105 is virtually identical, so I dug some out and put them in. the bolt is quite smooth now.
I haven’t had time to check velocity, but it seems similar to the Crosman 130, which makes sense given the size of the pump tube. I’m glad it’s done, this pistol was punishing my self-esteem!