Both the front and rear drive wheels/axles wobble in the frame.
If the wheels wobble as you rotate them, then the problem is not likely to be worn bearings. It is more likely that either the axles are bent, or the wheels weren't pressed on straight to begin with.
I used a bench vise to press on wheels for a long time, with various types of pads to protect the wheels. I found it almost impossible to get the wheels straight. Finally I purchased an arbor press outfit. I think it was one of the best train related purchases I ever made.
Years back, someone did come out with some wheel cups to be used with a bench vise.
Before Lionel marketed their arbor press, they recommended that repair stations make their own cups, and use a metal working lathe to press the wheels.
I think that I've read that some folks have had success using a drill press.
I reviewed the thread that BMORAN4 linked. It goes back to 3/12. One positive change is that both Hobby Horse and TTRP (Hennings) both make some cups that fit more than one style wheel.