In article . com,
Jules writes:
On Mon, 17 Aug 2009 21:54:11 +0100, The Natural Philosopher wrote:
its not hard to build..

I wonder if the original commercial product was canned over H+S worries...
must be fun if someone got stuck in the rollers, or chocks came loose, or
something in the mechanism fouled up. Not something a DIYer has to worry
about (well they do, but if something screws up it's their own fault) but
I could see it having some commercial issues...

Let's see... Using drill... bit jams... heavy load on generator...
large resistance on rollers... car comes bouncing off and drives
itself off into the distance...

--
Andrew Gabriel