I apologize if this question has been asked before, but I can't seem to find my particular shutter issue in past forum posts. So, I have a vintage Pentax H1 body where the mirror is stuck up and the second curtain is nowhere to be found. After some fiddling, I can cock the shutter, but when I release the shutter, the first curtain is the only one to release (sloooooowly). I can't seem to see or retrieve that 2nd curtain, thereby allowing the mirror to return down. The rewind button is also stuck down, but I pulled it back up with needle nose pliers. I removed the base plate but have no idea where to begin. Any possible easy fixes or ideas? Thank you in advance!