I think there is actually a tutorial on the grooving the rack @ buggy depot? I did it to 2 of our racks with no problem- other than the day I did it on my wife's Spiderbox her X-husband took it out and the very first turn he rolled it (I warned him too),nice broken arm!! Of course the wheel has to turn 1-1/4 rotations but the turning radius is worth it. You can file it or grind it if you've got a steady hand,you only need to add 2 grooves per side.
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