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You could bond (either completely or strategically) "hook-end" velcro to the horn and then have some custom sandbags made with "loop-end" velcro on one side.  http://www.uline.com/Product/ProductDetail.aspx?model=S-14556&ref=6426

If I were to have such horns (and in the future it is quite possible) I would be tempted to make them with two walls separated with sand or at least at the full weight.  For mobility/positioning I would mount them on robust castors for floor use.  I would be most tempted to fly them over the other channels, in which case I would love to use a jib crane.  https://www.gorbel.com/Products/Jibcranes/Ibeamjibcranes/wallcantileverjibcrane.aspx  They look quite reasonably priced...so much so that I would probably go for these even if floor positioning was the objective.

Did I ever mention that I am not married?  I guess it's obvious enough.
LBJ

Rerurn to Romy the Cat's Site