Hi Jeff,
Conrod sits on top of the flywheel, not sure why it was rubbing on the flywheel, I will investigate that later.
The PT pulley is a pressed metal one and fits straight onto the standard PT boss. The FC pulley is a solid one with a taper in it to fit the FC shaft taper
With the PT one the dished side faces up towards the underside of the motor and this gets the pulley at the right height for the motor to bolt directly to the base. I will get a pic of the base so you can see what goes on there. The Briggs and Honda motors use the same pulley but they have a boss to fit the shaft with the PT prong design but it uses a center bolt to hold it on. This is something I noticed with the 550 I was working on recently it has a FC motor but the boss is held on be a center bolt not the usual big nut. This FC must be specific to the self propelled, just thinking about it I will go back and look a bit closer at that one and have a look and take a fer pics. I removed the pulley on that one to get the belt on and off but didn't investigate it fully.
