Ok, need some help here.. I was trying to start my dynamx/os91.. then the rotor came off crooked.. after removing the spinner, spinner bolt and rotor bolt with washer.. found something broken.. I thought it was just dried up red loctite.. but once i assembly fan (rotor) back on the engine with the rotor bolt and washer.. and after tighten it very much.. the rotor spins freely. I noticed that there is some slack (rotor spins freely around os91 shaft..,even though its tighten all the way.. my question is that piece that broke off , make the rotor snug with the shaft, A WASHER? or a COLLET? and what part would that be a O.S. or DYNAMAX brand? its been so long since i had that engine/fan apart from jet forgot what was there.. it looks like a very thin collet or washer.. any know what im talking about???

I can post some pictures if needed..

thanks!!!