I had this installed in less than 20 minutes. So much easier and cheaper than repairing the worn out Jackshaft on our YerfDog. I used a good straight edge to make sure the pulley’s were aligned and so far, after a few months of pretty regular use, we are still on the same belt, and everything works like new. Great product at a great price, I’ll probably order another just to keep on the shelf as a spare.