[morzh]

I will be a bit of a nag, but many, many times here on this forum, we try to bring this point across: when dealing with old equipment, don't go half-a**, replace all that should be replaced, clean all that should be cleaned, check all that should be checked. These are 60 to 100 years old things, they had enough time to accumulate all kinds of dirt, dust, grime and oxidation.
Only after this you try for functionality.

Asking questions "why it does not work" before that is a waste of time.