I picked up an older ofna lx with an os max .21rz engine. It seemed to be siezed when I first got it. I took it apart and cleaned it and it seems to be fine. can't start it cause I dont have a bump box yet. It is an older os engine and I can't find anywhere to get parts. Id like to rebuild it. Anyone know where to get parts or if its even worth it? How do I find out what model it is?