We occasionally ride where flag is required. Sand Hollow in Southern Utah requires it, among others. I ordered a Tusk quick release mount for a 5/16 pole and figured I could modify it or a bracket in some way to connect to lock and ride max rail. To my pleasant surprise, the bolt head fit in the track opening perfectly and I slid it over and tightened nut and am in business. Took 2 minutes and zero mods.