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Wedge of #1, pivot of #8.
That's my vote.
:)
Thank you for undertaking this project with the wheels, I've always wanted to do it. Any pics of the wheels loaded up? Trying to get a better grasp...

I like the idea of turning your own grinding wheel on a lathe.
I've wanted to do this but never had a lathe. If someone is willing to turn some wheels ...?
A nice belt grinder has always been on...