[ShadowKnight]

Aye, sandpaper most likely would most likely be your best bet. Hint on using it, roll the sandpapaer around the shaft so that you sand evenly the whole circumference of the shaft. It may take a while but it's easier than having to go out and shell out the bucks to purchase 5/8" shaft and have it machined and wait, or wait for keyed 5/8" shaft to come via mail. I hope that helps...God bless