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How are you planning on holding the workpiece to the faceplate to recess the other side ?
The plan is not to use the faceplate for the other side. I will be holding the thin section of the hub with a 19mm collet and a live or dead centre on the other side.Vince
p.s. Is that the flywheel for the Corliss in your photo.
Just two questions. Ideally the subplate should be round to fully support the flywheel, but if it is rectangular would that be OK? Would an aluminium subplate do the job?