An apparatus including a housing defining a housing bore and a shaft extending within the housing bore. The shaft is deflectable and tillable within the housing bore. The apparatus further includes a fulcrum for tiltably supporting the shaft within the housing bore, a shaft deflector contained within the housing for providing a deflection of the shaft within the housing bore so that the shaft tilts about the fulcrum, and a deflection adjusting mechanism. The deflection adjusting mechanism includes a biasing device which responds to an external force exerted on the shaft in order to adjust the deflection of the shaft provided by the shaft deflector and thereby provide an adjusted deflection of the shaft.