Spedix 250 Servo Gimbal for GoPro Hero 3/4
This is a minimal 1-axis servo-gimbal (Pitch - forward movement only).
The Strap Mount has 2mm holes that match the plate included with the Spedix 250 kit.
The Hero Strap hangs from the mount with a 3mm bolt with a servo attached to the back of it. I specifically sized it for use with the Hitec HS-65HB, but other servos may fit.