wedge 48 the wedge 48 may be a generally conically or flat shaped wedge 48 the wedge 48 may include a threaded centrally disposed opening 48 a therethrough a screw 46 such as a socket head allen screw may be disposed in the narrow end of the wedge opening 48 a and supported for example by a thrust washer 44 upon rotation of the screw 46 the wedge 48 is drawn longitudinally along the corresponding inner surfaces 51 53 causing the diameter traversed between the upper carrier 42 and the carrier base 50 to increase thus by suitable operation of the screw 46 the upper carrier 42 and carrier base 50 may become laterally displaced and thus tightly compressed against the inner surface of the housing 10 a such compression may enable efficient transfer of acceleration applied to the housing 10 a to the carrier 13 and thus to the accelerometers on the sensor board 40 for recording and analysis the screw 46 may be covered by a cap 52 fastened to the ends of the upper carrier 42 to protect the screw 46 and parts of the carrier 42 50 during operation the cap 52 provides the function of allowing the screw 46 to push the wedge outwardly to release the carrier assembly 13 from the housing 10 a as the screw 46 is reverse rotated it moves closer to the cap 52 then touches the cap if reverse rotation of the screw 46 continues the cap 52 prevents the screw 46 from moving relative to carrier parts 42 and.