This is small aerotow hook for model aeroplane use. It has been designed for Hextronik MG-14-servo but it should be adaptable to any typical mid-size servo. Original design for PLA-3d-printing so some structural elements are overkill, but ...
No guarantees are given for any use, intended or noninteneded. Use at your own risk.
For further information see http://www.modeldesigns.iwaru.fi/tag/aerotow-hook/