Hi Jimmer, and a warm welcome to the forum. It's great to have another Scott Bonnar owner on board.
Firstly, it would help if we had the Model number/ Serial number of the machine, I suspect it may be a Model 33, 14" cut.
Seeing as you have separated the cutter clutch half, what I would do is remove the throttle assembly from the handle, undo the four bolts that attach the engine to the motor deck, and slide the engine off the clutch shaft, with the existing clutch half in place. You could then inspect the inside of this clutch half, to see if there is a circlip or some other method that is retaining this half in place.
Please let us know how you get on.
Once again,
