Butch Man pretty much nailed it. I run the Werks clutches and have for some time. I find 2 threads showing with the brass spring works better for me on the tracks I run on. Gives a little earlier engagement. I also like the Rulon shoes. They do grab very well. You have to set them up loose, atleast 3 threads or go with the black spring and 1-2 threads. They will slip alot when cold, but they heat up fast and are very consistent once up to temp. A lot of people I've talked to say they didn't like the Werks clutch because they couldn't get it to work right. Start with settings close to these and as Butch Man mentioned and you'll have it figured out in no time.