I am fixing up my old 27 inch wheel, 531 steel tubing, touring bike, and it only has braze ons for one water bottle cage---on the down tube. Years ago I would just attach a second cage to the seat tube with clear packaging tape, which worked fine, but looked pretty lame. I know I have seen doo dads for attaching a second cage here and there over the years, but haven't seen any lately. Does anyone have any recommendations for such a doo dad to install a cage to the seat tube (not post) that isn't overly expensive and makes for a nice, clean looking installation? Thanks.