Here is a link to an information site that can be of help to you. Be sure to read through Part I, II, III and IV and you should have a better understanding. http://www.rctek.com/info_centax_clutch.html
However, there is no substitute for getting a local driver at you track to give you some OJT and explanation. Be sure to shim the Bell housing up off of the shaft so that it spins freely. Next add or remove shims from between the Thrust Bearing and the bolt (that goes into the shaft) so that you still have free spinning ability after attaching the bolt to the shaft. Use this coupled with the article and local help and you will be underway.