| http://www.w3.org/ns/prov#value | - Preferably a sheet of covering material such as a woven fabric is provided over the rear side of each wing 13 to cover the mechanism therewithin and preferably a zip or other fastener is provided in the sheet to provide a fold-down panel to permit access to be gained to the mechanism for example for the purpose of adjusting the position of the set screws 32.
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