Very elegant is the installation of a speed-drive into an EBB: Specify the outer diameter of the eccentric and installation is nearly done!
Just slide the gearing system into the frame and clamp it!

Available for eccentrics from 53.5 up to 58.5 mm and width of 68 up to 76 mm.
Important: the frame needs a strong external clamping, not just a small set screw. It doesn't work with Bushnell-type eccentrics (see photo below).