Have an 8 year old Kohler faucet that only has cold water. Same faucet on the other side of the shower has hot & cold. Just purchased home & no model # known & not sure how to dismantel. Removed plastic plug on top of handle, removed allen screw, removed screw from end of stem, removed sleeve which exposed a round plastic part with an allen screw in it. I thought that this was the problem but on, another eleven dollers down the drain. I don't see any packing nuts and to date have not been able to find a parts layout showing how to dismantel.