I think my cross-pin issue is solved!!!
I had measured the diameter of my Whisper's action and found it to be 1.013". I've been pretty busy and haven't had much time to shoot, so I had been keeping an eye out for something to cap the end of my action. I know CDT says it should be OK, but the pin definitely moved on its own and that really bothers me for some reason.
Last weekend, I was at the hardware store picking up some stuff for the the yard. I was walking through the plumbing section when something caught my eye. I found a 1" copper pipe end cap that when measured was within 0.003" (smaller) than the rear of my action. Copper is pretty malleable so I figured I could make it work.
I got home and found a deep-well socket that measured 1.015". I measured and cut a slot into the copper to fit around the lug bolt using my dremel and then cleaned it up a bit with some files and sandpaper. Next, I forced the copper cap onto the bottom of the socket until it reached the lip at the bottom of the slot. I worked the socket under the lip (the socket was sitting a little cock-eyed in the cap now) and then set the cap on an anvil (any good flat and hard surface will work). I took a small piece of masonite to pad the socket (NEVER hit a socket with a hammer!!!) and pounded the socket into the copper cap. Once it bottomed out, I kept pounding on it to flatten the end.
After this minor work, the cap fit pretty well over the end of the action. I pinched it closed a tiny bit with my hand so it was snug on the action, and slid it on. It fits quite nicely, and doesn't look half bad. It fits into the wooden stock pretty well too.
I've been shooting about 100 pellets per night this week, and it seems to be working just fine. I was a bit concerned that it might ring like a bell when I fired the rifle, but I guess it is snug enough with the other parts that is is well dampened and doesn't make any noise.
Too bad this was so much easier than getting the correct end cap from Gamo.
