What are the differences between the older and newer ones? What is up with the small vs. large allen screw in the adjusters?
I have a couple of both, and the older smaller adjusting screws would wear out pretty quick. With the newer larger ones, I have yet to have one go bad. There seems to be no difference otherwise. Just don't tighten the older ones real tight, and they will last.
What is the size of the large one?
have you checked the new bear paw fletcher and their other products? They are available at custom kings website