central elongated channel 54 bridged across by a series of molded projecting u shaped cradles 56 which support the shaft 10 for rotation the end most cradles 56 also are recessed into endwalls 44 lever 12 projects outwardly from one endwall 44 the base 2 further is provided with laterally recessed keyways 58 alongside respective cradles 56 and communicating with channel 54 the shaft 10 is stacked onto the cradles 56 with the cam surfaces 8 and keys 14 projecting freely into the channel 54 the other ends of cam surfaces 8 project freely into recesses 60 in the cover the cover seats against the tops of the cradles providing clearance underneath for movement of the parts fig6 and 7 illustrate the keys slidably guided along keyways 58 upon rotation of shaft 10 from an open position to a closed position the base 2 further is provided with latch receiving recesses 62 flanked on both sides by respective cradles 56 fig3 shows the latches 24 of cover 22 passing through recesses 62 and shoulders 64 on the latch fingers overlapping and latching against an undercut bottom surface 65 of the bottom wall 40 during molding of the cover in a straight draw mold core pins not shown project through the cover 22 and provide a mold form against which the shoulders are molded and formed when the pins are withdrawn they leave behind in their place core pin apertures 66 in alignment with the shoulders 64 fig8 shows the cover molded with an inverted rounded projection 67 which registers in one detent 16 when shaft 10 is in an open position when the shaft is rotated to a closed position the detent action is overcome and depression 16a will become rotated into position for registration with projection 67.