I think I already might know the answer to this one but I shocked my well and think I clogged my cartridge (no flow of hot water from this faucet only and there is a sink after) Looking to take off the handle to find this. Any clues if that was the set screw or how in the world I remove this? I wouldn't put it past the previous owners to do that. I took out the screw in the middle and it will not budge. Tried vinegar and pb blaster with no luck. Thought it might have been corroded on. Tried a handle puller and it goes too far in then pushed on the cartridge inside and I dented the screw. Any ideas besides a hacksaw? Is that supposed to be a set screw? I have a screw removal set but would like to not have to buy a new handle of not needed. Thanks for any info.