When on holiday, the caravan mixer tap became stiff and was difficult to turn on and off. Armed with my plumbing tools I prepared to disassemble the tap and investigate the cause. I turned off the water pump. I turned on the tap to release the pressure and turned it off again - it was easy to operate. I checked again with the water pump on -it was working fine.
I put my tools away. There is an engineering rule I learned as as a student - If it works don't fix it.
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