Well, folks, I scrounged around the garage and found a 1/5" blade that
I had folded up ~ 15 years ago, and after cleaning the tires with soap,
water, and a stainless steel brush, proceeded to place the blade on the
tires.
I have a question, regarding tracking. When I have the blade centered
in the top wheel, it rides ~1/4-3/8" frp, the front edge of the bottom
wheel. Is that acceptable, or should I remove the bottom wheel and put
some sort of washer or shim before I put the bottom wheel back on?
I soaked my upper and lower bearings in mineral spirits last night, and
tonight have them soaking in slick 50. One of the bearings turned out
very nicely, and the other one spins freely, but not quite as freely as
the other bearing.

Thanks so much in advance for your help, suggestions and advice, Richard