Servo horn adaptor suit Futaba D type wheel

thingiverse

They needed a 16mm Futaba servo horn for an RC helicopter build and had a pack of small D type horns lying around, so they designed these adaptors to suit. They printed the 16mm version in ABS+ for temperature resistance and extra strength. They glued the adaptor to the horn with CA, but CA can be a bit brittle, so they think 2 part epoxy is a better choice and will use that for the next ones. You could also use tiny screws through the horn into the adaptor for added strength if your application requires it.