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@gbj_tester
Look at the load path and then tell me you'd want that as a safety critical assembly on your bike. Typical brake lever ratio is about 4:1, and the standard (EN14764:2005) brake test applies 180N at the lever, so 720N of cable tension. The bean from which the cable stop is hanging is split about 3:1 in favour of loading the forward end, so about 540N is applied to the lower element of the bottle cage, the important (i.e. weak) part of which is the beam under the bottle consisting of two parallel flat steel plates of approximately 4mm x 1mm section and 40mm long, loaded in the worst possible way. I leave it to mechanical engineering students to calculate the result of loading a cantilever beam in this way, the relevant formula can be found at http://www.engineersedge.com/beam_bending/beam_bending9.htm and http://www.engineersedge.com/calculators/section_square_case_6.htm