the inner sliding member 36 has an inner end 50 and an outer end 52 as best shown in fig6 each inner end 46 and 50 has a flat closure 54 which has an attachment point in the form of a threaded hole at its geometric center to this attachment point is bolted a slide flange 56 whose perimeter conforms in size and shape to the inner dimensions of the next outer telescopic member such that there is just sufficient clearance to provide for movement the slide flange 56 is fabricated from a durable material providing low sliding friction with the surface it contacts and is preferably fabricated from teflon to prevent the outer sliding member 34 from being pulled out too far out of the stationary member 28 the stationary member has a stop 58 located about one quarter of its length from the back end 32 the outer sliding member 34 has an internal stop 60 for the inner sliding member 36 both stops prevent the passage of the slide flanges 56 at the outer end 52 of the inner sliding member 36 are four orthogonal isoplanar lugs such as 62 shown in a front view in fig7 each lug having two holes for bolts such as 64 a first connecting plate 66 having holes which match those of the lugs is affixed to the lugs with bolts 64 in a vertical plane and orthogonal to the centerline of the telescopic arm 26 in addition the first connecting plate 66 has two symmetrically disposed.