Have a gauge made if you are serious about doing that many jobs. Aluminum with a fence on the underside for the 1-1/2" margin, and hardened bushings for the holes, which will accommodate a drill following the bushing through in the required spots..
Have a gauge made if you are serious about doing that many jobs. Aluminum with a fence on the underside for the 1-1/2" margin, and hardened bushings for the holes, which will accommodate a drill following the bushing through in the required spots..
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