member 12 the widened distal portion 20 of the rotating member 14 has an internal diameter and length which allows it to fit and rotate freely around the larger outer diameter portion 25 of the fixed member 12 the inverted distal end 28 on the interior surface of the rotating member 14 and central inversion 30 on the exterior surface of the rotating member 14 along with the ridge 24 and inverted proximal end 26 on the external surface of the fixed member 12 allow the fixed member 12 and the rotating member 14 to be coupled together without sliding in a lengthwise direction in relation to one another the proximal end of the rotating member 14 also has a vacuum tube connector 18 which is tapered to fit into the distal end of a vacuum tube 420 creating an airtight connection threaded engagement or other means of connecting well known in the art are also acceptable to connect the vacuum tube connector 18 to the vacuum tube 420 as shown in fig3 the internal surface 34 of the rotating member 14 is a straight cylinder with a widened internal diameter at the distal portion 20 a narrowed diameter at the proximal portion 21 and internal inversions of the widened distal portion 20 at the distal end 28 and near the lengthwise center 30 of the rotating member 14 the external surface of the widened portion 20 of the rotating member 14 has an arrow 35 see fig1 which may be printed or engraved in any practical.