If there's room you can attach your preventer (in a similar manner to seafrontier) to the vang attachment point in the boom, or to the vang shackle itself.
If it's a loose footed main then a simple strap around the boom will do the trick.
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)
Last edited by Faster; 09-02-2009 at 12:02 AM.