The pump/water system in the family cabin is acting up. Jacuzzi submersible pump (1/2 hp) installed in 1995. Square D Pumptrol pressure 20/40 pressure switch (adjusted to 20 cut in and 50 cut out), with Jacuzzi hydrocel (which has been there since the early 1970s). I have recently had to repeatedly adjust the cut in pressure (by tightening the top/larger nut) to maintain 20 lbs. I have in the past been able to then adjust the cut out pressure to 50 lbs by loosening the lower/smaller nut. However, after having to tighten the cut in nut again, I now can't adjust the cut out pressure because the nut no longer touches the spring. It cuts out at about 60-65 lbs (which I believe is the factory limit) but I fear this pressure may be too much for my system. Do I need a new pressure switch? Do they go bad over time? Is there something else going on with the system? I appreciate the insights, as it is a 5 hour drive for me to get to the cabin to address this problem (one way).