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With the tubing clamped in place, the jig is mounted on the bed of the milling machine and a 1 5/8-inch diameter cutter makes light work of notching the tube ends for the front bushing. The "bridge" previously mentioned is a stop, ensuring the cutter doesn't go any further than required. If you're making these at home you'll likely not have a milling machine, so will have to notch the tubing with a grinder. Take your time and ensure as snug a fit as possible between the tubing and the bushing.