a position within reach of the hand of a user in a preferred embodiment of the present invention a pair of springs 48 and 50 are anchored to lever 42 substantially midlength at anchor points 52 and 54 respectively and to their respective housing anchor points 56 and 58 such that the position of lever 42 is controlled and maintained in this way an over center type control of lever 42 may be realized or simply an arrangement where lever 42 occupies either an 34 on 34 position as shown in full lines in the drawing or an 34 off 34 position as shown in phantom or broken lines means for holding the ends of fiber optic cable 16 to and within housing 36 include a retainer plate 60 within which a resilient cable retainer clip 62 is situated with resilient fingers 64 able to engage and hold cable 16 in the position shown with its end held substantially normal or perpendicular with respect to the surface 66 of a mirror 68 integral at its midsection with hub 40 fiber optic cable 16 may be of a single light transmitting conduit or may consist of two or more such light transmitting paths what.