I have always used a 3 jaw puller, spray some WD40 or similar and a couple half decent hits with a rubber mallet around the edges, smack the crank one as well using short piece of broom handle or similar [whatever isnt steel and fits in the gap} before attaching the puller.
put a small amount of tension on the puller spray some more WD40, have a smoke and crack a beer, finish beer and tighten puller to remove flywheel. never broken one doing this never had to do more than that either and ive removed some very hard ones that mates have stuffed with all day.
P.S coffee and coke are acceptable subsitutes for beer and so is CHIVAS REGAL
and if you dont smoke twiddle your bloody thumbs for 5 minutes.
