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F2D control horns 28mm. The rear hole is 4mm, and the front "tap" is 3mm. This means the rear hole on the elevator has to be expanded to 4mm.
Don't know what size horn to buy, try one of each:
This newer version is slightly thicker, to increase the strength.
Disclamer: Designed for SLS printing, download, print and use at home at your own discretion.