Normally I do all of my own smithing but what I want to do is beyond my ability. I have a smith 3953 and want to convert it to sa/da with a manual hammer drop/safety. Im sure the internals from a 3913 will fit but I'm not sure what to replace. I'm about 20 mins outside of Philly on the commie side, so if anyone knows someone in this area that could do this I would greatly appreciate it.