Great tip for sliding the micrometer over instead of reseting and repositioning the micrometer for A to B taper measurment. I have a question regarding to out of round measurment on crank pin journal, isn't it (A + B measurment) - (C + D measurment) = out of round measurment?
Young man I would advice anyone here to not take advice from you. You don't have a clue what's going on not even alil bit that dial should be in the middle of the ring gear teeth at a 90degree not in the end of the teeth!
Preferably you want to align the dial indicator shaft as straight to ring gear tooth as possible. Leaning it over that far may give you a slightly inaccurate reading.