Re: PSC 37 running backstays...
Depending which mast you have, you may not need to rig your running backstays all that often, or need to tension them mightily when you do. As Niftynickers commented in a similar thread about a year ago:
"I asked Bill Crealock about this a few years ago.He said that the only time the running backs are needed is in heavy winds with the staysail loaded to prevent mast pumping.He then added that he designed the boat for a thinner,lighter mast and the backs were a necessity but that PSC used a much stronger heavier mast so the backs are somewhat redundant.I find with the backs rigged it is difficult to maneuver around them so I only use them when going offshore."
I got a similar response from Thumper when visiting the factory -- unless the mast is visibly pumping, the running backs are probably not necessary ... but fine if belts-and-suspenders approach is preferred, especially offshore in heavy weather.
We took a PSC 34 across (Abaco-Bermuda-Azores-Gibralter) two years ago, using the running backs only when we had the storm sail up on the baby stay. We just clipped the active running back to the factory padeye (about even with the aft corner of the cabin, same as on our 37) and cranked it in using the factory 4:1 fiddle block and camcleat. No mast pumping at all, for sure.