Prop reams come in metric and SAE, good idea to have both on hand. Ream and balance. Never ever use pliers to hold the thrust washer, they really will booger up the thrust washer. You can buy a piston stop that threads into the plug hole, I make my own, Fill the cylinder with oil and install a glow plug, there are other ways like using cord but a stop is better on a four stroke so you don't harm the valves. A lot of engines put the TDC mark on the thrust washer and a plier will remove the mark. I rebuild used four strokes and have several that the thrust washer is chewed up from people using pliers on them, then I have to use a wheel and cut in my own TDC marks. Use correct tools on an engine, there is nothing on one that calls for pliers.