Buy 6-sided sockets, not 12-sided, even less likely to slip.
Re: wheel bearings - if you need to replace them & there's no "bearing lip" to use as a drift point, then try the following (assuming you have access to a MIG welder):
Cut & file a small piece of steel bar to fit in the middle of the bearing, does not have to be a tight fit. Weld the ends of the steel to the inside of the inner bearing race and use this "bridge" as a drift point. The heat from the weld is enough to loosen the bearing in the wheel. Drift bearing out from opposite side, remove spacer tube, turn wheel over & there should still be enough heat in the wheel to allow removal of the remaining bearing. If not, heat wheel with a gas torch.
The above also works when removing disc mounting bolts that are rounded off - by welding a nut to the end of a steel bar (for a socket) & welding the other end to the bolt head. You'll need to keep cutting the bolts off if more than one needs to be removed.
One other point - when buying replacement disc bolts, don't assume that aftermarket bolts are cheaper. In the UK, M&P bolts for Yamaha's are £5.00 each, genuine bolts are under £2.00.
Steve
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