Hi Walt
I will be changing Stuart's TABs tomorrow for some of our upgraded ones. Imperial sockets aren't that difficult to come by - you tend to be able to buy sets with commonly used metric and imperial sockets.
However I think Stuart knows the difference between and allen key and a 12-point bolt :-) Now I have a set of metric allen keys in both 3/8" and 1/2" drive... I hope it's not some wierd american imperial bolt :-)
Martin