I have a 2010 M8, changed the belt on it last night and to be honest I found it a lot harder then any other sled I've owned. So I am hope to hear back from some members on there methods, good and bad of each. I compressed the spring allowing the belt to fall to the center of the secondary the rolled it over, but compressing the secondary on this sled is way harder then any others I have owned. So I hope to hear back from some of you guys/gals out there.:d