I've got the 16" bob roberts tool. It is not an allen wrench style, rather a standard flat screwdriver style. Still a nice tool to have but watch for splinters. It's made of fiberglass and may have a few strands poking out here and there. Yeoouch!
His 7 piece adjustment tool set contains some coil tools, and it comes with a little tube that you can jam a couple of the tools in to extend them (maybe it's for something else, but that's how i use it.) Nice little tool kit.
Not sure where to pick one up locally.
On adjusting the coil you probably already know, but be careful not to force the coil and work the tool back and forth a bit to get it moving.