Bearing Flanges for 608 Bearings and 6mm or 1/4" drive belts.Tire of you drive belts not centered on the idler bearings, and rubbing on the fender washers? Here are some printable flanges for your idler bearings to get rid of the problem. Print two flanges per bearing.Press a 608 bearing into one of the flanges. Place a tiny bit of Crazy Glue on the inside edge, where the two flanges will mate, and press the second flange onto the bearing.