accurate rotation of the spools and for providing adjustable tensioning on the respective spools so that the respective cables are fed at the desired degree of tension specifically the respective bearing and tensioning means in accordance with this invention comprise a plurality of respective bushings 43 fig2 and nuts 45 in combination with the a respective plurality of adjustably loadable bearings 47 each of the bushings has a respective radially outwardly protruding base or flange 49 at a first end 51 each bushing has a threaded second end 53 that threadedly engages the nut 45 the respective bushings 43 are made of a structurally strong material such as a metal like steel such that the respective bearings can be compressively held intermediate the respective bases and nuts 49 45 with adequate tension to provide the loading in fig2 it is understood that the respective spools 41 have cable wound thereon although the cable 23 is shown only on one spool the respective bearings 47 are angular contact loadable bearings having ball bearings 55 intermediate respective races 57 59 as can be seen the respective interior races 57 have a raised portion 61 of a larger outside diameter than an interior portion 63 similarly the radially outer race has respective outer portions 65 of radially larger diameter than a radially inwardly raised portion 67 in this way the ball bearings can be compressed between the respective raised portions when the bearings are properly paired thrust can be emplaced on the respective interior races by the respective nuts 45 and bases 49 on the respective bushings 43 expressed otherwise the respective nuts and bases 45 49 have a diameter less than the diameter of the outer race 58 but large enough to bear on the.