triangular post a round pole or combinations thereof preferably the vertical member is a square aluminum tube or an aluminum t rail referring to fig5 embodiment a a top view illustrates the coupling of a vertical member 505 as represented by a t rail for example without limitation to scaffold legs 520 a and 520 b via clamp member 525 the clamp member 525 is held together on one end by a pair of screws 510 that are threaded for ease of attachment and adjustment and on the other end the clamp member 525 surrounds and secures a pair of scaffold legs 520 the clamp member 525 includes a hinge 515 to facilitate attachment and provide flexibility e g based on various sizes etc the vertical member 505 provides support for and allows a sliding assembly not shown in the figure to slide vertically upwards and downwards fig5 embodiment b is a side view of a vertical member which in the figure is represented by a t rail provided merely for illustrative purposes while not intending to be limiting thereto referring to fig6 a t rail 602 is attached to a pump jack 603 which is operatively associated with and adapted to said t rail such that the pump jack 603 is able to slide vertically along said t rail 602 the t rail 602 is also attached to clamp members 604 a and 604 b that surround and grip a pair of scaffold legs 601 a and 601 b to secure the t rail 602 to the scaffold structure thereby allowing the pump jack 603 to.