Thanks for the info, we'll stick with the Harken for now. Others have lodged similar complaints on the spinlocks in the past, might be a dud spinlock...

Our halyard takeup goes slack when the chute is up per Microwind racing's guide. This prevents a giant crease from running down the sail in all but super light air conditions. What happened in this case was the mast rotator got between the front beam and the halyard before it goes to the turning block on the tramp, if I recall correctly. Definitely an unusual situation, I'll take a closer look at rigging options, I prefer less blocks not more. As the dam crew, it was clearly all my fault, the third time was the charm.