I posted in this forum last year when I acquired a Trek T100 tandem (at that point I needed to know how to adjust the eccentric BB to tension the timing chain properly). I got responses very quickly that gave me exactly the information I needed, and we were able to get the tandem up and running with no problems- so thanks to everyone who responded to that post. Since then, I've mostly been lurking, learning about concerns specific to tandems.
I've searched the tandem forum as well as Google for the answer to my current question, and while I have found some threads referring to tandem brake splitters, most of what I see either refers to splitting lines for S&S-coupled tandems or other items that aren't quite what I'm looking for (to skip all the background detail of my post below and move to my question, see the final two paragraphs).
I'm looking into changing the gearing and brake setup on the bike, so I have a parts question. It currently has a drum brake on the rear and a rim brake on each wheel (the original cantis as best I can tell). The left-hand lever controls the drum brake, and while we don't use it much, we would like to retain it as we found it helpful occasionally when riding on a cross-country trip last summer. The right-hand lever controls both of the rim brakes. Both brake cables come to the lever and the head of each one fits into the crossbar inside the lever so that they're activated together. They are fine-tuned to engage in the front first and more strongly, then in the rear so as to prevent accidental locking of the rear and the resultant potential problems.
The bike had a six-speed freewheel on it which I have replaced with a seven-speed freewheel (I changed the bar-cons to friction mode to allow proper shifting). I have a spare set of RSX 7-speed brifters that I'd like to put on the bike (naturally I'll keep the bar-cons in the parts bin as spares). Since the existing right-hand lever controls both brakes, and I'd like to keep the drag brake as well, I need a splitter that will allow one STI brifter to control two calipers. I know that QBP has at least one item that fits the one-lever-to-two-brakes bill, but from the picture I saw of it in the catalog, I'm not sure that it would be the best option. It appears to be just a cylinder into which I assume each cable would run; there must be some sort of attachment like an allen screw to fasten them in, but I couldn't see it in the catalog image.
What I'm looking for, then, is recommendations from you esteemed tandemers as to what you have found to be most useful and reliable for this type of setup. If at all possible, please provide part numbers or names for easier identification.
Thanks in advance,