Client has a shower handle where the Allen key has broken off into the set screw after they attempted to access the shower cartridge. After several attempts of trying to drill out the Allen key and find alternative ways of removal, I managed to wiggle the handle off and disassemble the shower furniture. I picked up and replaced the cartridge for the master bathroom shower valve. Tested for leaks from the cartridge, reassembled the shower handle and verified it functioned smoothly. The cartridge is a P1 pressure balancing cartridge for 1/2” rite temp valves (GP800881) Water heaters are from 2019 Water pressure is 65 PSI