Gill,
Just a suggestion ... I'm not sure how your mast rotation system is confiquired, but I replaced the Jr Jam Cleats used on my TheMightyHobie18 and P19MX with "spinlocs" several years ago .... my (now 14yr old) niece whom races with me, could not release the mast rotation and outhaul lines ... she would struggle, I even found it difficult at times to release the rotator and ouhaul lines. So I installed the spinlocs on the boom .... a BIG improvement!!!! Megan loves those "puppies", just taps them and they release ... and very easy to adjust. You need to install a "fairlead" in front of the mast rotation spinloc so the line enters the spinloc in-line with the spinloc. the spinloc works better and you don't creat a side-load on the spinloc that could break/tear it off the boom (especially when gybeing/tacking).
A fairlead would help the camcleat also I would believe ... could the springs be failing because of "side-loading"??? I wonder????
So maybe you want to give them a try for those applications ... instead of the camcleat. Our roundings of the windward mark have greatly improved as our ability to "switch" gears from upwind to downwind mode is alot smoother. (I didn't use camcleats since they would stick-out/overhang the sides of the boom. I was afraid that if you got smacked/hit with the boom you could be killed by the protruding camcleat.)
Harry Murphey
PS: "puppies"- used here as American slang of indearment ... everyone loves puppies and not as a actual canine/dog being attached to the boom.