Nmtb50 arbor shown has been over-ground and touches spindle only a little at large end. I’m pretty sure additional grinding won’t help. A new one with the necessary 2 1/4-10 threads is $550. and used ones are like hens’ teeth. So I’d like to see how it might be built-up. Welding? If so what rod?Plating? Aluminum duct tape? Can’t be done?
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