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  • I'd probably go for a little widget to clamp into the axle slot of the dropout, with a drill bushing pressed into it. You'd then be drilling into a concave surface, which is less likely to push the drill off centre, and you're using the most regular features of the existing component as your alignment guide.

  • I presume a decent frame builder will have a jig for drilling?

    Why would they? The dropouts are drilled and tapped at the dropout factory.

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