Intro to a port job

Cudafever said

I messed and messed with my grinder, couldn't make it concentric, usually .003 to 005 thow out of round. Even bought a new pilot that fit much better, but couldn't make it true
Found an old timer that showed me how to float the grinder. He took one of my ports that i had way off, and seconds had it true. Put my dial on it and it was true.
I rarely can get it that true, but most of the time can get it with in 1/2 of a thou to 1. ( .0005-.001)

Before you do any 65 or grater bottom cuts make sure you have a proper bounce spring in it. or you will shatter a lot of stones. the spring under the stone is a simple thing, haven't shatter a stone sense.

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You don't need to push on it.
I watched 5 vids before trying, seeing all kinds of ways, wrong and right, wrong still working but never checked with a gauge..
It was zero'd at the 20, what's it out .001ish?
I 'heard' up to .005 is factory tolerance.
I realize I didn't even zero it on 0..just 20 because I was watching how far it moved more than if it was set to zero. It has a spring inside the holder/arbor and not in the port around the pilot. Some dont use a spring at all. Lol Still having fun . I need to get my fine stones in order for the seat cuts. I think I just sized up stones and angles I had and didnt pay attention to finish as much as feel on this practice run.