Where are the cups? You should be able to tap the bearings off the spindle and get replacements at your local bearing shop.
that is a ‘91 and originally came with 600 8spd (downtube shifters) including crank and BB. What crank is on it now?
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk