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I'd strongly discourage this. That point of the seat post will be the most loaded and a hole that size will likely lead to failure.
If trying to route a dynamo cable into the frame I'd suggest going through the top of the seatpost at the clamp mechanism if possible.
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In the seat post? With 4mm wall thickness? I'd say no, if you deburr the hole. But I'm a bit blasé about drilling holes in things. Small ones, anyway.
motoko
Brommers
@miro_o
If I drill a 6mm round hole in the side of my alloy (27.2mm, 4mm wall thickness) just above where the post enters the frame, will I perish in untimely, fiery fashion?