The rear SB stanchion had an argument with a Norfolk Island pine branch during the transport to the launch site and lost, it snapped about 200 mm up from the deck after bending 90 degrees. I repaired it by laminating an inner tube in, but to no avail as soon after someone used it to pull the boat in while mooring and it broke above the repair.
In considering a fix, I took my inability to tension the life lines properly (due to the whippyness of the carbon stanchions) into account and settled on using stainless steel stanchions fore and aft. By returning the aft stanchion to the sloping edge it also functions as a handrail whilst boarding from the marina pontoon.
I was able to tension the lifelines satisfactorily and they will now support my weigth without bending out unduly.
I also provide eyes to clip on my rear safety lines that run in front of the targa and these provide additional lateral support