| Robert,
Yes, I guess I forgot to mention the 'deformed' valve case possibility as well.
That's probably the most common cause of sticky valves I would think. Either from dropping, bumping or over aggressive cleaning pressure on the slide puts a slight deformation on the case which 'pinches' the valve piston and viola! you have a sticky valve.
I agree - if cleaning doesn't fix a sticky valve take it to a good tech - the case is probably out of round.
Greg
PS - Are you are a trained tech, just curious?
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