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The mount replaces the handlebar mount bit of the headlamp and enables it to be mounted to a GoPro compatible mounting system.
The design fits many generic Chinese bike headlamps. First designed to be used on the MagicShine MJ-808 family of lights (and clones), but it fits many other designs, tested on the Solarstorm X2 family of lights and many other mutli-LED Chinese generic lights. Compatible with bottom-exiting cable (through the mont).
If you have doubts the mount will fit your light, contact me with some pictures of the light. A flat area with a screw hole is required for the mount to function.