On Nov 10, 9:38*am, exray wrote:
Tim Shoppa wrote:

Others tell me this is well-known but I still don't have any
understanding
of why metal would shrink or grow with time.

Tim N3QE

Where there's pot metal involved it certainly swells up. *Thats a
scourge in 1920s sets that use pot metal pulleys, brackets and capacitor
frames. *My understanding is that it is due to reaction/corrosion
between the various metals in the 'pot' mix.

-Bill

This sounds like what may have happened to some old drives I had.
A guy gave me half a bushel of the things telling me he thought they
would work if I cleaned them up. I bet he had gone through the other
half a bushel trying. I was able to repair a few by drilling out the
holes
and inserting the brass ferrules removed from old pots. I hope this
proved
to be a good fix and the guy that bought them from me isnt cursing
me too loudly.


Jimmie