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Part No 168 looks like a Woodruf key – lucky you as it should mean that the timing is pre-set. I would guess that it would require two bolts screwed through the flywheel to push the flywheel off the shaft. From experience it is absolutely no point in trying to prize the flywheel off from the edges as that will either break the flywheel or distort the diameter of the centre hole and make it bind to the shaft even more. Alternatively you might need to fix a plate between the two threaded holes and use a centre bolt pushing against the shaft to draw the flywheel off. Best of luck – keep us posted when the issue is resolved.
Regards
John E-W