I made up the a 1/4" plate, drilled 8mm holes and drilled and taped the hub/blade plate, inserted bolts of various lengths into the crank hole. it released slowly pulling the hub off the crankshaft. There was no 'key' in the keyway.

I now have to install the the blade bar onto the new motor. Any ideas as I am reluctant to hammer it onto the motor crankshaft incase of damaging the crankshaft bearings etc.

Thanks
Oscar2