The TT .46 Pro does not use set screws to hold the carb in place and makes no difference whether or not you have the newer slant needle carb. The carb on that engine is held in place by a round wedge rod with threads on on end, it is inserted on one side and a nut is tightened on the threaded protrusion to tighten.

This is probably why you could not find them if you said it was for a 'pro'. Suspect you have the .46GP but I don,t know how that one is attached.

John