I often run out of properly sized pipe clamps any time I have a project with more than a few doors to glue up. Rather than spread the gluing stage over several days, I added an extra clamp head and tail stop to each pipe, where shown. (You may have to have your pipes threaded on the other end at your local plumbing store). Now, they do double duty, letting me glue up two doors at once.—Dewayne Ketchell, Roy, Utah