This is not really tandem specific, but I'm looking for information from tandem type people. I picked up 4 carbon water bottle cages (Serfas CC-1 Cirque), just because they look so cool. I went to install the lower captain's, and found that it won't fit because it sits too close to the seat tube.
I would like to drill new holes in the cage to mount it a little further up the down tube (about 3/8th of an inch). Any advice? Will the extra holes make the cage too weak to hold a full waterbottle?