This sort of trouble is quite common for some reason or other when using that second method. I'm not sure why it is so unreliable I have my theories but I can't be sure so I'm not going to bring that to the table just yet...
I reckon you need to beg / borrow / steal a DTI (dial test indicator) and do the whole job if you want to do this. I will add that these gauges don't cost so so so much - and you will find that they are useful for other things (such as wheel bearing clearance measurements)
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