Army:

Thanks for the post,
Please keep in mind "plastigage will not give you a true reading for roundness and taper, but it is better than nothing.

This is why a "machinist" will not use palstigage but a mic instead. Also never use any grease or such when you are measuring for precision as it can easily give you a false reading + .003-.004+ even with a thin film.

I have been a machinist for 30 years and feel qualified to help out with your post and hope you take no offense.

God Bless
John