I like to use pipe clamps for this reason. To me, the clamp pictured is too light duty to truly clamp what it is they are clamping here. I cant imagine a glueup wide enough to exceed a clamp length that a standard pony type clamp could sufficiently clamp. Thus, the pipe clamp. I keep an assortment of pipes threaded at both ends and simply join them together using straight threaded couplers. This also eliminates the offset clamping force problem inherent in the solution featured. Cheap, easy and knockdown.