Hi – I wish to be to extend a Dexion SpeedFrame building stand that I made up a number of years ago but am having difficulty in sourcing lengths of the black 1” square section integral to the system. The various knock-up angular corners pieces are currently being listed on ebay but no sign of a supplier of the beam section. Can anyone suggest a likely supplier of the steel 1” square section or is it a case that it is no longer a current system and has been replaced by an upgraded model. Thanks in advance