I have tried the rubber mallet, and even a block of wood for that good jolt but it wont move.Some you can just give em a good hard quick pull with your fingers/hands and they pop off. Have used a rubber mallet and ever so lightly tapped around the edge of the fly wheel to break things loose....buuuuut you have to be really careful to not tap the wheel to forcefully.
Others are stuck on the crank a bit more and require a bolt to back it off its mount. If you PM me your addy i'll send you the bolt.
That would be the preferable method. Using the rear axle as a puller is safer than whacking any part of the flywheel with a hammer or block of wood.it is the same size as the rear axle i used an extra I had as a bolt to pop my flywheel loose just need a big enough wrench to turn that axle