> I think the westy luggage rack cleat would do it.
> If 2 X 6mm bolts wont hold it, you have a MUCH bigger problem resulting
> from
> a crash than the top of the seat coming loose. I would be suprised to hear
> that the breaking strength of the ~1-1.5" (sorry for the english units) is
> more than 300#.
>
> This is the solution I mean to apply but there are several other things
> ahead of it in the cue.
>
>
Better still would be something like a rock climbing bolt hanger <*
http://tinyurl.com/8ax9o>.
*5000lb breaking strength, takes a 3/8" bolt. Not only is it designed to
take dynamic loads (the luggage cleat design is more for a static load), but
it's also even cheaper and much easier to procure. Three bucks at your local
outdoorsy store that sells climbing gear.

--
John Bange
'90 Vanagon - "Geldsauger"