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Ah, yes. That looks promising.

Filling it with sand is a technique used in the tube bending industry but it can be hard to do on our scale models. I find a piece of round plastic rod that fits snug inside the tube, it doesn't have to be very tight, but the tighter the better. Let the insert exceed the tubing and you should be able to pull it out after the bend is done. You may need some good pliers to pull the plastic rod out of the aluminium tube, that's why you don't want your insert to be overly tight. Beerz, Felix