I agree, with Endeavor BP selling at 44 dollars it is worth doing. I also believe from my experience with the Triumph that a #21 drill makes the optimum size channel. Do you happened to know how the way Mike did it with the threads going on through if I read it right worked out? I was hoping to catch up with him and find out. I know that some times things like that can make a difference. I suspect he had a idea he was checking out. Lee