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@greg_conti
Oh my god! You lot make me lauph. (renting holes... half a hole..!)
Anodising: dipping in acid bath while passing electric current through it.
The effect is to etch the surface somewhat. The dyes in the acid solution 'key' into the etched surface. Very pretty but...
talk to an engineer about crack propagation and fatigue life and they'll recommend that smoother surface finish contributes to longevity...
NB brittleness is lack of ductility... a metalurgical property... is that gonna be affected by anodising?
Speaking of holes.... whats the diffinitive answer: trying to lace a 16 hole rim onto a 32 hole hub ?