I sure hope some guys like Pe Reivers, Dick Hansen, RCIGN1, AV8TOR, Brillie Brothers, tim220225, and others that know where this data can be found will from time to time add anything in the art of porting. Basically the tools used. The right tool means everything some time. Thanks Very Much. Capt,n P.S. I will post a photo of a 25cc Homelite cyl that I modified the webb to keep piston ring intact...into a wedge shape. May not be the best.???