Place bars on a flat surface. With the clamp heads at the front end of the bars, set the tail blocks into the bars to accomodate the width of panel you will be gluing. Roll the O-rings up or down so that the jaws clamp at the approximate midpoint of the panel thickness. Apply glue to the component edges, lay them on the bars and drop the mating drilled bar on top. Pressing down firmly on the top bar, tighten the clamps. The upper bar will lock into position as soon as clamping pressure is applied.
Note: As with any bar clamps, strips of plastic or wax paper should seperate the bars from the panel to prevent glue buildup on the bars or accidental bonding.