Enlighten me on a Harding 4-Jaw chuck please

Since each jaw adjusts individually you only need to grind each jaw face to be 90 degrees with some type of fixture or by eyeballing it

I do not trust my eyes anymore for that! I'd better use some fixture.
Thanks Mark
Petros
 
The guy gave me an extra £15 ($20) off for the missing key!
I think £186 is a fair price for a PB chuck, although postage is quite a lot (£37)
 
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