i have always just drilled the hole without supporting the rim,
use a sharp 1/8th drill bit, slower drill speed minimal pressure, and the bit will do all the work.
then go up to an 8.5mm bit and do the same.
and finish it off with a fine file to deburr it, and a dab of clear to seal the anodising
should i get some news paper spray a bit of clear out onto it then get a tiny brush then seal up the anodising?
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