I’m not trying to be mean or anything, but if you’re not sure of something, please, just don’t make the post; you’re confusing him. WD40 will indeed gunk up the bearing, but can easily be cleaned out. WD40 should only be used on bearings if the bearing is rusted and cleaned afterwards. And using a drill to break in a bearing is fine, just a lot more hassle. Any dirt can be cleaned out.