I help a friend install one on a 42S. I was at first skeptical installing a staysail on a in mast main, but B sail all was good. They liked the idea of using the windlass
bulkhead to fasten the chain plate. We removed the winch
, installed the plate and added longer bolts with little modification. You'll need a rigger to install topside of the furler
fitting, just above the spreaders. Needs to be drilled and tapped, but B says okay. I'd give them a call to make sure your specific model and supplied equipment will allow this modification without changing the mast or something drastic.