Hello, I was attempting to change the cartridge for my tub/shower and was having trouble with the set screw. I put some WD40 on it, and seemed to be having some luck, only to find out I've sheared the screw in half. My problem now is that the handle will not come off and it is so close to the part you hold on to that it is difficult to get a drill in there to even attempt to drill a hole for a screw extractor. Any suggestions? The handle now wiggles, I still have a drip coming out of the tap and my shower is now a slight mess because I had to fix other parts as well. It is a Moen faucet like the one pictured.