The construction consists of three vertical columns and two crossbars placed on the following heights: 200 mm- 1pc., 250mm- 2 pcs., and 300 mm- 2 pcs. from the rubber foundation. Crossbar fittings are put into effect with collars. The length of crossbars are 1200 mm- 1pc., 1700mm- 1pc. The height of columns is 400 mm.