Damn! That was easier than I thought!
My gold Hipshot Xtender GB-7 arrived on Friday--five days ahead of schedule. Yesterday I carved out a couple of hours to do the installation. To my delight and surprise, I finished in about half an hour. That's it! I can now jump from a perfectly-tuned E down to a perfectly-tuned D with the flick of a lever.
Here's what it looked like, before (top row) and after (bottom):