You are right, the bearing seal will need to be replaced if you butcher it the way the manual states!. Is there a reason you are replacing the bearings in the first place? grinding noises? Here is a suggestion, buy a dolly (no, not one of those inflatable ones!) a 6" X 1/2" diameter brass rod. Must be brass (softer metal than steel, so won't damage bearings!) When you have removed your disk rotor, remove/lift out the ouside bearing. Use the dolly, sliding it in from the ouside of the disk and locate the OUTER lip of the inside bearing, the bearing that lives behind the seal your inquiring about. (not the inside ring of the bearing, or you will trash the bearing). You will feel a lip of about 2mm, use a hammer to strike the dolly and move around the edge of the bearing, striking only the outer edge of the bearing. The seal will pop out eventaully, undamged seal and bearing! Clean all parts in petrol, DO NOT spin the bearingl, you will trash it. When the bearings are clean, check the rollers for scouring marks, collapsed, dull gey wear marks in case hardening etc. If they are still smooth and shiny with all their case hardening intact, repack and replace, you then only need a new seal! (you can reuse the original if it's undamaged at a push) If you intend replacing the bearings anyway, you will need a dolly to drive out the bearing cups if you intend replacing the bearings, so buy a dolly anyway. The waffler- my 2 cents.