Julien,

If I remember your first inquiry, there was mention of a 'rocky bottom'. If
so this is NOT the best holding ground for a mushroom type. Beside which, if
this is going to be a 'permanent' mooring your going to need a LOT of mass.
Plus someone with the proper equipment to place them.

Many a dock is held in place using a couple of old engine blocks with a
chain threaded through them. If you don't have a tidal stream, a big shift
in tides, or frequent storm conditions, that's the way I'd explore. Two or
three {for each 'corner'}with a heavy chain threaded through & shackled to
keep them together. Also a hell of a lot cheaper then the mushrooms . . .
and a lot less shipping if the scrap yard is local.

Just remember the 'crossing arrangement' of the float chains.

Regards & Good Luck,
Rom Magen
Backyard Boatshop

"Julien Mills" wrote in message
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SNIP

Thanks, this is quite interesting. Maybe I'll have to go ahead and get
a real mushroom or two. Railroad wheels sound heavy, very heavy.