The AK-100 attaches to Wimberley Sidekicks produced BEFORE May 2018, providing a dovetail width that conforms to the limited clamping range of lever-style clamps. (Traditional twist-knob clamps will work with the AK-100 as well.)
Sidekicks produced after May 2018 have a built-in anodized dovetail plate with a safety stop screw and do not require the AK-100 for Arca-Swiss lever-style clamps or use of safety stop screw feature.