in place projects through the hole 26 in the clamp bar 22 in this exemplary embodiment the hole 26 is suitably a u00bc u2033 hole by way of example but not limitation in one representative embodiment the two clamp bars 22 suitably are separated from each other by the slot 24 with a width of u00be u2033 and the counter bore 27 providing space for the springs may be 0 875 u2033 in diameter and 0 75 u2033 deep furthermore in an exemplary embodiment the clamp bars 22 themselves are suitably 1 75 u2033 tall and 1 125 u2033 wide it will be appreciated that any suitable dimensions for the slot 24 pads 32 keeper 30 and the clamp bars 22 that provide access to the work piece and make provision for the keepers 30 to be moveably linked to the clamp bars 32 and apply clamping pressure to the work piece 4 may be utilized in yet another aspect of the embodiment shown in fig1 a through 2 the machine screw 35 forming the keeper 30 is held from falling out of the clamp bars 32 with two jammed nuts 31 threaded on the machine screw 35 where the screw 35 projects through the top surface 16 of the clamp bar 22 the jam nuts 31 are suitably installed at the very top of the machine screw 35 above the top surface 16 of the clamp bar 22 the jam nuts 31 have a larger outside diameter than the hole 26 through the clamp bar 22 and thus hold the machine screw 35 in place this retains the spring 36 and the pad 32 in.