I just take a torch and snip the gear and it will fall right off. While I've got the cutting tip on the torch I usually lay the gear on a couple of bricks and go around and around and heat the gear up and with a set of water pump plyers pick it up and it will set right on the wheel, if it don't, heat the gear somemore, after you have done a few hundred you know just how much to heat it. Make sure the bevel on the gear faces the clutch side of the wheel. Wife's oven will work good, just that the pie out first. It's nice to have a hammer and a punch handy to tap the gear to make sure it's seated. Walt