Hi Norm,
On the Powertorques the blade boss is an interference fit on the flywheel not the shaft as I found out when I pulled one off and the flywheel came with it. It was very hard to get the boss off the flywheel afterwards. I guess the old dissimilar metal corrosion was the culprit. The next one I took off left the flywheel behind but that needed a few days soaking in WD40 before it would leave the engine. Of course there is almost no need to ever take one off except if you want to machine the blade boss as I did then. I have given up on that idea now and decided to machine the pulley to fit over the standard blade boss.so that any Powertorque will fit as a straight swap over. Hopefully a full crank will also fit by turning the pulley upside down.
All the best
Jeff
