JNewell
Member
While completely cleaning out a Security Six, I reassembled the cylinder assembly and installed it on the crane, then installed the crane and cylinder into the frame to check cylinder rotation.
There was a slow point in the rotation (not really rough -- slight but clearly increased friction). At this point, the trigger group, cylinder latch (bolt), hammer and mainspring are all out of the frame. Everything's been cleaned (no powder, etc. under the extractor star).
I swung the crane open and rotated the cylinder -- very free rotation, so I'm thinking it can't be crud left in the cylinder/extractor parts. The extractor rod looked a little bent, so I replaced it with a new factory part after verifying that the center pin is straight. I visually checked the extractor rod runout -- looks fine. Swung the crane back into the frame and same result: a slight drag during a small portion of the rotation, perhaps 1/6 or less.
The amount of drag is pretty minor. You wouldn't notice it in a normal function check (I didn't, anyway). I'm a little puzzled. If the crane were bent, cylinder would drag all the way around, rather than during just a small portion of its rotation, right? It seems like something's eccentric, but I'm not sure what. There doesn't appear to be any abnormal wear at either end of the cylinder. The cylinder rotates freely on the crane barrel when out of the frame. The gun has plenty of miles on it but shows no signs of wear that would make it out of spec (in any respect that I've found without mic'ing every part and getting out the dial indicator, anyway).
Thanks for reading the long post. Any thoughts or suggestions very much appreciated.
There was a slow point in the rotation (not really rough -- slight but clearly increased friction). At this point, the trigger group, cylinder latch (bolt), hammer and mainspring are all out of the frame. Everything's been cleaned (no powder, etc. under the extractor star).
I swung the crane open and rotated the cylinder -- very free rotation, so I'm thinking it can't be crud left in the cylinder/extractor parts. The extractor rod looked a little bent, so I replaced it with a new factory part after verifying that the center pin is straight. I visually checked the extractor rod runout -- looks fine. Swung the crane back into the frame and same result: a slight drag during a small portion of the rotation, perhaps 1/6 or less.
The amount of drag is pretty minor. You wouldn't notice it in a normal function check (I didn't, anyway). I'm a little puzzled. If the crane were bent, cylinder would drag all the way around, rather than during just a small portion of its rotation, right? It seems like something's eccentric, but I'm not sure what. There doesn't appear to be any abnormal wear at either end of the cylinder. The cylinder rotates freely on the crane barrel when out of the frame. The gun has plenty of miles on it but shows no signs of wear that would make it out of spec (in any respect that I've found without mic'ing every part and getting out the dial indicator, anyway).
Thanks for reading the long post. Any thoughts or suggestions very much appreciated.
