Even after reverse drilling the heck out of the set screw, the handle is still not coming out. After measuring the length of the drill bit and comparing it with new handle and the new cartridge, I know for sure that the drill has gone through the stem of the old cartridge. What is holding it? I tried to pop it out by prying with a screw driver but the plastic cap chips.
Between the base of the faucet and the handle, there is plastic cap which threads over the cartridge in to the base. The piece of it is already broken. That is not going to thread out easy. I have soaked everything in the white vinegar but still no dice.
I am going to talk with Kohler and get them to ship me a new cap and then I will try to rotate the old cap while the handle is still in place. The plastic thing is called bonnet. The real metal cap which screws in the base is under that one. This means unless I get the handle off, I can NOT rotate the metal cap. The base is already flaking off the chrome. I don't know if Kohler warranties that or not.
I am now wondering if replacing the whole faucet would be easier than struggling with this one. I can buy new a faucet and two 24" feed pipes, probably all under $100