With advice from FrankR (Thank you Frank) I have replaced the bearing on a couple of those pinions. Here is what I do:
Using a hammer and cold chisel knock the bearing cage and the rollers off the bearing. I put the pinion in a vise between two pieces of wood. Then using a HFreight die grinder grind into the inner race. See photo. When the race is about paper thin the race will pry off the pinion easily. Grind carefully and you will hardly contact the pinion surface anywhere.
Reassemble by putting the pinion in the freezer and the bearing in the stove. I think I set the stove for 270F or so. I usually put some sheet metal over and under the bearing so it does not get local heating from the electric coils ( or from a gas flame if that is what you have.) High local heating could possibly change the bearing heat treatment. Remove the pinion from the freezer and place it upright on a hardwood board. Remove the bearing from the stove and place it onto the pinion. Use a rag on your pliers so you do not cool the bearing. Bearing should just drop down but have a hammer and wood dowel to tap the bearing to assure it is all the way down onto the shims and hold while things cool.
Be sure you assemble with the bearing taper in the right direction.
