Unfortunately, I do not know the size. I only know that the pile of allen wrenches sitting on my workbench is missing the one that fits.
I guess I need to go out and buy a new set, with all the sizes intact.
I do know that it's small, around 8/32 of an inch, but I won't know until I buy a new set and find the one that fits. Then there is the possibility that my set screw is stripped. Which means, the only real option is to send it to Klaus and maybe one of his techs can figure out how to remove it. This may require a blow torch, a chain saw, a hammer and some duct tape.
mike