Close up - side view Limit Switch Cam modified for PSS Beam “drop out” contingency. Beam Direction Beam direction into page. Modified Cam New Cam Engaged with Limit Switches, installed location. Cam position IF Chamfered cam shaft drops edges to allow below hardstop retrieval without position. damage to limit (Hardstop not in switches. place.) Side view of low location, one switch removed from view for clarity.