There are some other possibilities but you have to be careful, and if you dont feel comfortable, take it to a dealer.One that often works is to carefully use a couple of flat-blade screwdrivers, wrap a layer of electrical tape or two around the tips to protect the paint on the gear case, then insert between the gear case and prop. Loosen the prop nut a couple of turns. Then, while applying pressure with the two screw drivers (levering against the prop and gear case), use a block of wood and a hammer and whack the prop shaft. You leave the nut on so there is no chance of impacting the threads or bradding the end of the prop shaft so that you cant get the nut back on. You want to be cautious as there are bearings and gears that are always in contact and you dont want to bang the pinion/drive gear together. Once you have taken a gear case or two apart, you get a feel for how much pressure to apply and how hard to whack the thing without fear of damage. You can also try a puller that applies pressure to the prop shaft with “hooks” that will grab on to the front surface of the hub/prop (inside the exhaust opening. Beware of heat as you have a double rubber oil seal on the prop shaft at the back of the gear case. Dont want to get those seals hot, nor do you want to melt the rubber-like shock absorber in the hub.The only ones I have ever had trouble removing were those that were exposed to salt water which will produce corrosion if you are not careful to re-grease the shaft every few months at least. The puller approach is probably the least dangerous
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