dripping delex faucet

our bathroom sink is dripping, so i pull off the hot and cold handles of the delex and... am stumped. do i need to replace the removable stem? i was expecting a washer. the stem has a gasket in the middle (doesnt appear to come apart), and if you fit that stem into the recepticle on the sink, it aligns with a hole that has a rubber gasket around it. the rubber gasket sitting in the HOT recepticle doesn't appear to want to be removed but does seem like it's not 100% seated. I guess it's an O ring? What next? Thanks!!!
- The plumbing clueless (who did manage to fix our leaky toilet last month somehow).
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Rob wrote:

http://www.deltafaucet.com/smap/index.html
Excellent repair section (PDF)
The rubber "seats" do come out and are what usually fail. Get genuine Delta parts.
Jim
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thanks!!!!! hmmmmm..... theres supposed to be a spring in there? :) :). off to the hardware store i go...........
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thanks, no more drip. (and i found the mysterious hidden spring!)
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