We purchased a kohler faucet a couple of years ago and the knobs have begun to drip. We have the parts to fix it problem but cannot get the faucet or temperature knobs apart. I'm a skilled craftsman and know how to apply a lot of pressure, when the knobs wouldn't I feel ike there must be some sort of trick to the hardware to get it to come apart without having to take the bolts out from underneath the sink. The product number is : K 16109 4A CP. Any help you could give would be greatly appreciated!