I doubt it's THAT non-standard a size... btw you might try using a Torx bit if you have one that's close - sometimes they'll bite when an allen key is rounded or not the right size.. These are the GM "six point star" type tool.
Something else to think about is getting one of those inexpensive "multi-bit" driver kits for drills and hex shaft quick change screwdrivers.. you'll end up with a whole range of types and sizes.. comes in real handy and is usually sold in a nice case that stows well on board.
".. 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)
1984 Fast/Nicholson 345 "FastForward"
Last edited by Faster; 05-03-2009 at 12:25 AM.