OK, maybe I'm not using this sucker properly. This is a Jha puller so it has a separate insert to put into the threads of the crank (where the retaining bolt was). That way it doesn't damage the threads.

So, i insert the main body of the puller into the flywheel (the reverse threaded bit). Then I tighten the bolt into the crank (the part with the t-handle). I hand tighten as much as I can.

Now what do I do? Do I keep on tightening until the flywheel pops off? Seems like a hell of a lot pressure I need to put on the puller.

I can't really hit the end of the puller because it is threaded into the main body of the puller (the part that is reverse threaded).