One of the ones I did was JBWelding a broken tower, like it sounds like you're doing. The other of mine was 'building' a tower out of JBWeld for one whose upper half of the tower had completely CORRODED away!!
Both worked. But, in the case of the broken tower, I completely coated the thing with JBWeld. It was ugly, but I somehow needed to provide some strength, so I just kinda slathered the whole thing.
Good luck with yours.
Kirk