insertion as best seen in fig5 portions of the tabs 154 are received in the slot 112 more particularly the edge 120 of the top member 110 engages the peripheries of the end tabs 154 and seats in adjacent detents 158 it will be appreciated from the foregoing that the hinge block 150 may be rotated about the hinge projections 156 the engagement between the edge 120 and the detents 158 allows the hinge block 150 to be rotated upon application of deliberate force whereupon the flexible resilient top member 110 deflects along the edge 120 but otherwise restricts rotation of the hinge block 150 relative to the base 102 the stops 159 prevent the hinge block 150 from being over rotated by provision of the plurality of detents 158 the holder may be rotated into and maintained in multiple angular positions other means for selectively adjusting the position of the holder include a frictional engagement which may include a wingnut or the like for selectively adjusting the amount of friction the holder 180 and thereby the device 5 if mounted in the holder 180 may be mounted on the hinge block 150 and thereby the base 102 by inserting the projections 160 into the slots 192 the holder 180 is then rotated forwardly to insert the connector 166 into the slot 194 and into the device 5 if the device 5 is mounted in the holder 180 the holder 180 is rotated forwardly until the latch posts 162 are received in the locator recesses 196 and deflected outwardly as the holder 180 passes over the barbs 162 a and the latch posts 162 latch the holder 180 to the hinge.