With expert help, I have almost completed a rebuild on my Black Shadow engine. But, I find that I have one grub screw too many! The 2 that close the oil galleries in the primary cover are in place and there is one other that measures .233 dia x .53 long that is left over. Does anyone know somewhere in the engine that needs a grub screw that I could have overlooked? I don’t see any indication of it in the parts diagrams and my memory doesn’t help me from the time the engine was dismantled. Is there somewhere else on the cycle parts that it could have come from? Thanks -here's hoping I don't have to take it all apart again! Sam.