I'm very nearly ready to split the crankcases on my C15F side point. But I am a bit perplexed about the next step. I've got the crankshaft pinion off. According to service sheet 423A, I now need to remove the oil pump and its drive, and then pull off the crankshaft worm wheel. According to Rupert's book, on 65 onward engines the worm wheel and oil pump etc can be left in place, and on end fed models the worm wheel is removed by the action of pushing the crank out of the timing side bearing. But the C15F is not end fed - so I'm not sure where that leaves me. I'd rather not disturb the oil pump unless I have to.
The worm wheel is not usually a tight fit on the timing side mainshaft, tapping a small screwdriver between the inner end of the worm and the shoulder on the crank should start it moving. The screwdriver end can then be twisted in the resulting gap to move it further, and then gradually thicker levers can be used. Be careful not to apply pressure to the thin ends of the worm teeth, they are brittle and will break off.
I've just tried - and as you said, it wasn't very tight. I think that I had been surprised by how tight the timing pinion had been, and I was expecting the worm wheel to be similarly tight.