Hello! I'm doing a rebuild on my Bendix Treadle Vac booster and master cylinder. I've hit a snag and cannot remove the compensator valve. I've tried PB Blaster, WD 40, rubbing alcohol, hot water, the shop manual recommended 1 1/8 thin wall socket, and mild violence with a drill, screwdriver, and rubber mallet. I cannot get it to budge. Any tips and tricks that might help? For reference, everything is disassembled and off the master cylinder right now except for that valve. Thank you!