Quick-Detach Cam Lever Design

I need a compact cam-lever mechanism that lets my current Picatinny-mounted device snap on and off in seconds without losing zero. Only the mechanism itself has to be created; I will handle the rest of the assembly once I have a solid model... (Budget: $10 - $30 USD, Jobs: 3D Design, 3D Modelling, 3D Printing, CAD / SolidWorks, CAD/CAM, Mechanical Engineering, Product Design, Prototyping, Rapid Prototyping, Solidworks)