38mm Rocket 3 Hole Drill Guide
thingiverse
This is a step-by-step guide for drilling three evenly spaced holes around a 38mm Madcow carbon tube or thick-wall fiberglass tube, which measures 1.65 inches in diameter. The goal is to create three precise holes with diameters of 1/16 inch as pilot holes for either 2-56 or 4-40 threaded holes. To use the 4-40 thread size, you will need to enlarge the pilot hole before threading it.
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