After moving my gantry back and forth by hand, it looks like the bearings are making flats on the galvanized pipe, but only on one side. I think if that's the case, the flatter they get the better, as there will be more contact area. Time will tell what will happen. Keep in mind this is with a 50lb gantry, and the bearings tightened up until there is no play at all.Originally Posted by joe2000che