thanks for the info! My bottle cage is actually on my down tube, but I want to add another one on the seat post. Looking more closely at my bike, I've realized that I DO actually have a second set of braze-ons, on the downtube, but on the BOTTOM of the tube (in my naivety I didn't even think to look there). I could use that one as well, but it seems mighty exposed to road hazards, etc.