I have the proper internal bearing puller with the slide hammer type attachment, works very well, but I have to say that an M12 rawl bolt also works just fine, I've done two sets with the rawl bolt and it was easy. Secret is to heat up the wheel are surrounding the bearing with a hot air paint stripper gun first, if you do that the bearings will pull out with very little force, same trick to drop the new ones in. Put the bearings in the freezer overnight as well to make life easy.
