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@Emyr
On Magicshine MJ808 clones, the bar clamp normally has a slotted knob that takes up the space in the cable-exit hole, and a screw (hidden by the padding) to secure it and prevent rotation.
It should be reasonably easy to replicate the knob-and-screw layout in a rack-mount-adapter, but you wouldn't be able to remove the light for theft-prevention.