'87 lavatory pfister wide faucet drips and the replacement stem inserts into a 3 part sleeve that has a rubber washer in the bottom section. I removed the inner plunger stem easily, but just putting the new stem in , does not stop the drip . There are 3 recessed openings in this third sleeve for delivering the water to the spout, so I gerry-rigged a hook to attempt to loosen and remove the sleeve; but they wouldn't budge;they are stuck in the tap housing. How to remove this inner sleeve, so the washer can be replaced?

Plumbing - Price Pfister