Bought one of those hydraulic pressure gauges with a shim kit. My less than 100 hr BX23S was reading 1750PSIG so I was going to add the 0.2 mm shim to bring it up 80PSI more. Took off the cap, installed it and retest showed 2500PSIG. Tried it with the stock shims and still 2500PSIG. Took out all...