props, reamers, shaft diameter, spinners?
What is the proper method of using this 'tool'? A) just keep going till the right tip diameter comes out the front of prop? or B) remove and insert from opposite side?
Either. Use you're own disgression depending on prop thickness.
What type of fit are we looking for? a) a little play, b) snug slip fit, or c) lets apply a little more pressure and push that hummer onto the shaft?
b) snug slip fit
Are the prop shafts on production RC motors normally a true dimension. like 5/16" shaft equalling .3125"?
Yes.