wedges could have different shapes referring also to fig3 and 4 in this embodiment each wedge has two wedge members 50 and 52 however in alternate embodiments each wedge could have more or less than two wedge members the first wedge member 50 is preferably a one piece cast metal member however in alternate embodiments the first wedge member 50 could be comprised of multiple members could be comprised of any suitable material s and or could be manufactured by any suitable process the first wedge member 50 generally comprises four sides 54 56 58 60 located between a front end 62 and a rear end 64 the inner side 54 has a curved conductor contact surface 66 the inner side 54 proximate the bottom side 58 also comprises a wedge member interlock projection 70 the top side 56 has a finger contact section 68 adapted to allow a finger of a user to move the first wedge member however in an alternate embodiment the finger contact section might not be provided or any suitable type of section for direct interaction with the user could be provided the thickness of the first wedge member 50 between the two lateral sides 54 and 60 increases from the front end 62 to the rear end 64 to form a general wedge shape the bottom side 58 generally comprises a latching recess 72 a spring contacting section 74 and a groove 76 the sides 60 of the first wedge members 50 are located against the inner surfaces of the sides.