sidewall 14 in section 20 while cables 16 extend therethrough and through sidewall 14 as by screwing down cap 42 which rests on the top of slide 38 cap 42 being threaded to sidewall 14 fig1 cables 16 are crimped and held in place in section 20 the greater the displacement the greater the shortening of the portion of cables 16 outside section 20 thus the length and effective stiffness of such cable portion is easily regulated to accommodate various diameters of well casing 34 such crimping is easily removed by unscrewing cap 42 for example when replacing worn out cables 16 fig3 illustrates a second method of anchoring cables 16 in place in section 20 this can be accomplished by pouring molten potting material 44 into the interior 30 of section 20 to fill interior 30 and then allowing material 44 to harden material 44 could be any suitable material preferably metal selected from the group consisting of aluminum solder and mixtures thereof it will be noted that in this instance cables 16 need not span section 20 but merely need to be long enough to be firmly embeddable in material 44 a third method of securing cables 16 in section 20 is schematically illustrated in fig4 thus cap 42 in this instance is provided with pins 46 which join it to the top of slide 38 so that rotation of cap 42 automatically rotates slide 38 with it again causing crimping and locking of cables 16 passing through aligned openings 18 and 40 a tight fit between cap 42 and sidewall 14 and or set screws 48 or the.