After disassembling and reassembling my model 57-1 for cleaning, I went to work on my 686-1. First time that I've had it apart, so things were trying, but I managed. When I went to reassemble everything, the rebound slide spring slipped a bit and I went to do it again. That's when I noticed that the small pin that goes inside of the rebound spring was gone. I didn't disassemble the whole thing when i removed it, so I didn't notice it. I also didn't see, or hear it land when it slipped on installation. I went to find one at gunparts, and noticed that they don't list one for a 686-1, nor does anyone else. Am I looking for something that I never lost?