Hello Andreas, thank you for your response. Andreas I am not clear concerning the fan hub. I beleive you picture shows were this adapter will be stationary. This is my need, I have a type IV going into a 1302. It will have a 911/260mm fan and ring attached. I had Rimco arc the case for the fan to contact. I will be using a CSP shroud. I am trying to mod up some pulley besides the old "V' groove pulley style. My project will have a 6 groove serpertine belt, with a idler pulley. So the fan will have a serpertine pulley also. From what I have seen everyone is just adapting a type one crank pulley to the type IV crank hub. I intend to have both the hub and pulley mechined from one peice of matal. Thus the need to konw how much shimm between the fan and crank hub.
Wish me luck
