The basic problem is the design of the carriage!? The vertical play is adjusted with clamp & jack screws vaguely locating the clamp strips on the underside of the bed; that's common on larger lathes, doesn't scale down well for 7x? lathes. The fix is to replace the screw adjustment system with shims & have the clamp screws tight. It can get a little tedious if the underside of the bed is uneven, requiring some work with? curved files, "rifflers."
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Roy
