The parts you are looking for will have to be made from scratch. The selector arm, if you have the broken off piece, may be able to braze the pieces back together and make it work for your needs. As for the thread dial, you may be able to adapt one from another lathe to your lathe. It depends on the pitch of your lead screw to determine whos thread dial that could be used and or the number of teeth on the gear that is used for the thread dial. The chances of finding replacement parts for this lathe is null today. Ken