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Corner holes for ultimate Hex ; I did some math/dwg after I did the three hadles for my son-in-law's jointer in the pix and find there is a bit of off set toward the center that is beneficial for the operation. These were obviously a lot larger than the 4mm one above . I don't have the actual scheme noted any longer but it bears doing the "arithmetic" again if it comes up. ...lew...
Chris, very nice tool. Now I want one. Cheers Dan
SnapToff!! Love the name...may borrow that next time I have to make a wrench, or modify one.