Moped Army

I just made a clutch puller for the same type of bike. It's a good tool but I have one question. On the clutch, there's the recessed area in to which the pullers center bolt can screw. That would be pushing on the end of the shaft and would provide the opposite force. However, there is also a threaded recess on the end of the crank.

My question is, does the puller's center bolt have to thread in to the crank or can it simply push on the end?

If I can get this clutch off, I'll wiki the shit out of whatever I learned.