2 Pieces Standard 1/4 to 3/8 Inch Metal Plug Converter Thread Adapter Spigot Stud for Studio Light Stand Hot Shoe Adapter Ball Head Wireless Flash Receiver Trigger: Amazon.de: Electronics & Photo
Ball Stud Fasteners | Olander
Neewer Standard 1/4 ”zu 3/8” Männlichen Konverter Gewinde Schraube Adapter Zapfen Stud für Studio Licht Stehen, wireless Flash Receiver|Follow Focus| - AliExpress
Pencom ball stud clip | 3D CAD Model Library | GrabCAD