I get all excited over this stuff. I didn't have a "clutch spring compressor tool" for my sportster & I wasn't about to fork out 60 bones for one either. So I did a little digging on the interweb & found this idea. An oil filter wrench (size D). This wrench happens to be right around 3.5 inches in diameter & is a perfect fit. The only modification needed was to drill out the square hole to a 1/2 inch round. After that I found a washer & used the same nut that came off the bike to make it all work; & it works beautifully! By the way, the filter wrench I bought is plastic & showed absolutely no signs of breaking. So I just spent a whopping $6 on an otherwise over complicated & over priced tool to accomplish the same job. I love this sh#t!