Hi, I recently purchased a used repro Smith carbine that had a few undiscovered problem until after the purchase. I've fixed a few problems like a clogged nipple and frozen cleanout screw - The former owner never-ever cleaned them and they were packed solid. The main problem now is the difficulty in opening the breech. It's almost a two-handed pull, with the top strap not rising far enough to easily clear (what I call) the rear bolster. The actuator is a silly millimeter too short to lift the strap with ease, but it looks to be intact and not worn. Any ideas? is there any kind of manual abailable for disassembly/assembly that I can get before I go off half-cocked and tear into things?