No parts for cat clutches anymore as mentioned is correct,if a roller goes toss the clutch and get a new one. STM as mentioned does make a replacement billet bulletproof spider and billet cover that is serviceable when rollers need replacement. The billet cover also allows you to run more spring options like the doo springs with big rates. To get spider of you need to heat with oxy acetylene to get heat rapid and hot to break loctite as they are loctited on from factory. Once heated then you need to use a grunt tool that is about 2 1/2 feet long from Cat to spin spider off as it is threated on. Do not heat with propane as not rapid and hot enough it will just damage clutch/bushings from over heating to long. When putting new spider on from STM or if you were able to find a stocker from somewhere make sure you use the right loctite to reinstall spider(red I beleive). The wrong loctite may cause spider to move and overtighten itself on running and crack the spider destroying clutch/motor or yourself. An yes as stated above the correct torque of spider and nut is 250 foot pounds. Only problem I found with STM is you also have to buy there tools to service spider and also CAt tools to get catch parts off. STM is the way to go especially if your running the 4 weight clutch. Hope this helps.