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Product Description
F2D control horns 32mm. 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:
https://www.shapeways.com/product/UK4KH65SC/f2d-control-horn-21-35mm-2nd-gen
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.