Well,after about 2 months of messing with my mini mill,I finally did what hundreds of other have done; broke the plastic gear.And I didn't just chip a few teeth off,I shattered it. It came out in about 5 pieces.So,I was wondering what other people have done when this happened to them. It seems to me there are 2 options. The metal gears replacements,or convert to belt drive. I'm leaning towards the metal gears because they are a third of the price.Does anyone know if you have to be Mr. Goodwrench to change these(there are 3 gears in the set), or can just about anyone do it? TIA