Thanks Allen,
I met much the same problem in setting up my machine.
" First problem I encountered was that the supplied hex/allen key is the wrong size ". This was the first thing I noticed and I reckon it was NOT a mistake.
On arrival the machine had a blade fitted, this is a pinned blade. The manual says to remove this blade and take out the pins and refit ? using the grub screw at the side to hold the blade in place. The allen key doesn't fit and anyone without some engineering knowledge may hit trouble here as I found the grub screw driven in to the bottom of the thread AND locked in with blue Loctite. Anyone using that key to try and remove the grub screw would be in big trouble with a knackered key and grub screw. I removed the top blade holder and held it over the gas flame on the cooker for a couple of minutes, removed the grub screw and re-tapped the hole 6mm. Fortunately there was no problem with the bottom blade holder and the machine can use pinned and un-pinned blades.