Due to recent events, I was given a Model 12 that is in very bad shape. It wasn't hard to disassemble and attempt to clean, but I'm a bit confused as to proper reassembly sequence. If someone has a assembly/disassembly diagram and instructions, I would appreciate it. Thanks in advance. I'm having the most trouble getting the bolt back in the receiver because of the "shell stop" and "bolt retaining lever". I have the basic diagram and parts list, but I really need some instructions. Any help would be greatly appreciated!