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These bikes were originally equipped with ball (roller) bearings, and there's nothing wrong with that approach in this application, but tapered bearings are a definite upgrade and should outlast the OEM bearings.
But how to remove and install the pressed-on lower bearing without the nice factory tools? Well, the old bearing inner race won't drive off, so I use a Dremel with a cut-off blade and very carefully slice the race with a diagonal cut, stopping just shy of cutting into the shaft itself. Right at that magical point the bearing race gives a little bing as it loosens its grip on the shaft — it can then be pried off with a screwdriver blade. In the photo above are (left to right) the new lower seal, the new bearing, the old inner race and the old outer race. I will use the old parts as adaptors to drive the new bearing in place.
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Job done. Reassemble onto the frame, install the forks, etc., and this project will be back on its own two feet — with a nice, smooth steering action.