Glad it worked out, Jimmer. I don't think you could have achieved much force that way, due to the strength limitations of the G clamps, so it must have been at most a very light press fit as Deejay indicated. It looks to me as if that threaded part was not part of the crankshaft, but a tapered thread on a sleeve which was locked onto the crankshaft by the nut. Hence tightening the nut against the clutch pulled the tapered sleeve through the tapered bore of the clutch and locked it to the shaft. If I'm right there would not have been a key in the tapered sleeve - the longitudinal slot would have been there to allow the sleeve to contract when it was pulled through. The right way to get the clutch off would be to loosen the nut, then give the clutch a smack with a mallet, toward the engine/nut, so it moved down the taper and released itself from the crankshaft. This would be easily done without any tools other than a spanner and a mallet.
Last edited by grumpy; 10/03/11 02:51 AM. Reason: Clarify
