Hi,

I belong to a little brick bungalow in the midwest, built in '54,
original (copper) bath plumbing.

Very recently I notice severely restricted water pressure from
the bath wash basin. Only one output spout. Very little water
flow from either hot or cold. Doesn't seem to increase when
I open both.

I replaced the washers some months ago. Last week the screw
and washer on the cold side came loose. I fished the screw
and washer out, checked for blockage, replaced the screw.
It was after that that the restricted flow became very
noticeable.

Water flow in all other parts of the house is fine.

What commonly causes such a problem?

TIA,
Puddin'