Rear drum cylinder leak?

As to RRR suggestion-- I had to do an emergency rear wheel cylinder repair on a 67 malibu some years ago,(Sunday evening 2 hours from home)-- so I took the w/c apart, used emery cloth & my finger to hone, cleaned & reused the cups & springs & drove that baby home-- in fact that w/c never failed until the car was sold.

This was before the China invasion-- my point is that they can take some abuse & still work.
Lawrence