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Thanks, guys. I stopped my subscription to HSM a couple of years ago, so I don't have access to the Jan-Feb issue. There's a copy for sale on Ebay but the guy wants $14.00 + shipping.I've come up with a drawing with an alternative design. The disks are 1.75" diameter and the drive roller is 1/2" diameter with a rubber o-ring fitted. This tapping machine would be used for taps ranging in size from 1-73 up to maybe 8-32.