Fixed side:

Active side:

Flat vise for clamping square stock, adjustable up to the full width of the dovetail bed.

The flat vise can be used in a number of orientations, or used to hold up to 8 independent pieces simultaneously.

The standard vise is secured to the dovetail bed by tightening the two M3 screws on the side of the block. This will push the tapered blocks against the dovetail bed, securing it in place.  

Once the standard vise has been secure in place, the stock can be clamped into place by tightening the M4 screw on the active jaw.

CAD models of this vise setup can be found here: 3Axis Dovetail with Vise