Patent ID: 8025153

Claim:
A screen support frame sub-assembly comprising: an elongate bar connected to a tubular element, the tubular element having an internal screw thread that defines a primary socket; a securing device comprising a substantially cylindrical insert that is formed from a synthetic plastic material, the insert comprising a flange that extends peripherally around an open upper end of the insert and a downwardly depending skirt fast with the flange, the flange comprising a key hole into which a key is capable of being inserted to screw the securing device into the primary socket of the tubular element, wherein an external screw-thread is provided on an outer surface of the skirt that is complementary to the internal screw thread of the tubular element, and wherein the flange and the skirt define a secondary opening in the form of a secondary socket, wherein the secondary socket is configured to receive protrusions of adjacent screening panels.