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If you're concerned about the tack falling off, simply get some shock cord and fashion/sieze an eye in each end and then attach the middle of it to the forestay tang. You'll have to play around with the overall length and distance from tang to hook, but once the sail's hooked on, slip the eye of the shock cord over the tack hook.. this will prevent the sail from slipping off.
Sorry for the crappy graphic, but looking at the red line to illustrate how that would sit.. an eye in the shock cord would slip over the end of the hook. Set up for enough tension when installed to stay put. A double ended setup would cover both hooks.
EDIT: OOPS... cross posted with SFC....
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)