tapered by beveling or champfering as best seen in fig9 and 10 the guide ring 22 may be locked in place by means of a small bump or similar projection 23 which engages a hole in the end of segment 10 to provide some resiliency to facilitate installation of the guide ring a narrow slot or slit 24 is provided in the wall adjacent to projection 23 an internal stop ring 25 is fixed to the inside wall of tubular segment 10 spaced downwardly from the top end thereof as explained in greater detail hereinafter stop ring 25 functions to limit outward extension of intermediate tubular segment 11 and serves as a guide ring and bushing for that segment intermediate tubular flagpole segment 11 is of a diameter adapted to fit telescopically with a close slide fit within the bushings of guide ring 22 and stop ring 25 of bottom segment 10 the bottommost end of intermediate segment 11 is provided with a flanged plug 26 held in place as by means of screw 27 for example the outer periphery of the flanged shoulder 28 of plug 26 engages the inside wall of tubular segment 10 to guide telescopic movement of intermediate segment 11 therein the top edge of shoulder 28 engages the bottom edge of stop ring 25 to limit outward extension of intermediate segment 11 a drain hole.