I had the best luck with my Milwaukee
heat gun(on High,500+ deg) with my Ninja. Front bearing seal failed, and the swap out took 5 minutes to heat, get the bearing out, and install the new bearing while the case was still hot. Hang the block off a coat hanger, and use caution. A 1/2 inch wooden dowel is handy to have close when doing the swap, won't scratch internals, usually fits to remove front bearing. Assemble with the crank as the alignment tool.