A 4mm adapter similar to the camera mounting plate for mounting the new lever-release clamp (QRC-40L) on the NN3 MK3 or NN6 upper rail.
It allows sliding without twisting on the rail and quickly switching the clamp in 90-degree orientations to the rail – perfect if you have an Arca L Bracket fitted to your camera.
Arca-Swiss Style Lever-Release Clamp 40mm (QRC-40L) (F2102) available here
See our quick installation guide below

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