http://www.denialville.com/stop-faucet-leaks/
faucet still leaking after replacing the stem assembly?
I'm having a difficult time correcting my leaking faucet, I've tried almost everything but nothing seems to work! I've had a leaky compression faucet for some time; at first, I thought it was all due to the old/worn out stem assembly. I was surely positive it was that damn old thing because when I took it out the faucet stopped leaking. But now, after replacing that old stem assembly with a new one, the leaking started back up again. Now I believe the problem may lie in the seat valve under the sink...
I also tried looking up for pictures of my stem assembling, thinking I may be missing a part, but there isn't any.
Any suggestions or thoughts as to how to fix my sink is encouraged.
always replace the faucet's seat when replacing the stem as a matched set.
the stem is worthless if the seat has a nick in it.
if you can replace the stem you are handy enough to replace the seat. it is located just below the stem. you will probably need a special "SEAT WRENCH" to remove it and match it with a new one.
good luck. it's way cheaper than a new faucet.