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I build a Large Contact Wheel tool arm for my 2 x 72 Belt Grinder.
1-1/2" x 1-1/2" x .250 x 16" Steel Tubing
10" Contact Wheel from Amazon
1/2" Cap Bolt & Nut & Washers for axle - length for your grinder.
Axle Spacer for your grinder so wheel aligns.