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JohnP

wrote in :

What type of edge finder do you use (wiggler, split-cylinder or
electronic) and can you recommend it?

As an ex-Jig Borer I would use a Mercer dial indicator in a jointed arm in
the spindle and rotate it to touch each side of a slip gauge - adjusting
until I got equal readings and then pitch over by hald the slip gauge size.
Alternatively I had a block with a should that I could hold onto the edge
that had a slot centred over the shoulder. Rotate the dial indicator to get
equal readings.