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that must be minimum weight
I bet you could get the Cateye down to <10g including glue without starting to cut into the optical element, but since the emitter is red and the lens isn't doing much, you could bin the cover too. There's a magnet in there which isn't doing anything once you commit to glue. Switching from a CR2032 to a CR2012 saves 1.7g at the expense of run time, but it should still be about 100h and without even having to modify the battery terminals.
While the main part of the season seems to be a pissing contest between 4Fourth and Exposure to see who can blind the most drivers, when hill climb time comes around again the contest is going to be passing light inspection at under 5g
gbj_tester
I will up the ante and if cutting down to glue on, and offsetting the extra weight loss but addition of glue would balance the weight back to 12g (that must be minimum weight)
But gluing to the post and losing the rubber band would have better airflow so more aero so faster :)