[ (What is LOCO anyway??) [/quote]

Not sure, but I think it's that guy hiding inside my mirror

There is quite an elaborate set-up for cruising monohulls; generally it attaches the jib to the tiller. It uses a combination of bungees, blocks and small line. It requires relatively high quality component to work, because it is easily defeated by internal friction.

An archaic device called a "handy billy" might well be adapted to this purpose.

btw- when I single handed a H16, I NEVER put down the mainsheet! Learned that the hard way! When I was knocked down, my reflex was to maintain a death grip on the main sheet!