[kwilford]

But the trick here is to drill out the broken bolts from the BACK. The threads in the gear don't go all the way through, so you will never successfully drill the bolt out from the front. You also need to use a "cobalt" drill bit, as the grade 10.9 bolts are VERY hard. I found the best way was to use a drill press, set at very low speed, and use lots of pressure. Once the bit grabs the broken bolt, it just spins out the front of the hole. But if you wreck the threads, you are hooped. The gear is hardened, and I could NOT get a tapered tap to successfully re-thread the holes, even with very minor damage. And "nobody" was also correct in saying to be careful with the tap. I broke mine inside one of the holes I was trying to re-thread, and there is no way to remove the broken piece. A tap is WAY too hard to drill out, even with a cobalt bit