Like these Gear Shaft set. One problem with it though, it seems to be about 0.001mm fatter than the 5mm hole it's suppose to fit. It's not a bad thing, it kinda mean you need to lubricate it a bit, and put your bearings in properly first before putting the gears in. Actually makes the bearing works for you rather than the shaft, which is what you really want. So you want something lighter than the stock and pretty (but no one will see it). Get one of these. Good spares to have.