Shower handle stuck

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.

Appears to be Moen. Middle screw should be only screw, put it back in a few turns and then use the handle puller. Always have the screw in place when using a handle remover otherwise there is seldom a solid surface for the puller screw to push against.

Correct. I should have put that I figured out it was a Moen T2151. The only thing I get when I put the screw in about 1-2 turns is a damaged screw head. It pushes in so far with no movement that I have to get a new screw because I can barely remove it. Do they sell bolts of this thread type that has a flat, hard surface I could press against? Hate losing this shower but if having to cut it is the only way then I will have to do that.

Probably the worst is that you will have to buy a new trim out kit for the valve.

I would bet that some careful work with a rubber mallet and a padded pry bar will get it off.

The open hole in the handle of picture 2 is where the screw you need to unscrewis. Once the screw is removed pull and wiggle the handle until it comes off. You will need a 1222 cartridge.