OK lads and lasse's panic ove have found one burried in my untidy garage, food for thought....clear it up.
According to the holder the hex( allen key sett) its 8mm for those who can't find information on this hex bolt. The newer versions hace Torqe heads and likely to be same size but only a guess, as the Torqe ones are 'Star' shaped.
Bob UK
August 2015