detent roller 84 of detent element 80 into engagement with the surface of pivot member 40 while index cam 26 holds brake element 70 spaced apart from brake segment 60 in this case switch 130 is closed to energize an indicator device such as lamp 144 and switch 124 is open to de energize lamp 142 to indicate that the assembly 10 is in the spring centered detent held mode now the lever 22 and pivot member 40 may be rotated against the bias of centering spring 106 depending upon which direction the lever 22 is pivoted then either comparator 170 or 172 changes to a high output condition from its normally low condition depending upon the relationship between the signal from potentiometer 116 and reference level signals vr1 and vr2 depending upon which comparator goes high then either solenoid 174 or 176 of solenoid operated valve 178 is energized causing extension or retraction respectively of cylinder 180 if the lever 22 is pivoted far enough then the detent roller 84 falls into either of detent recesses 62 or 64 to hold the lever 22 in its displaced position when cylinder 180 reaches the end of its stroke a pressure buildup on either side of its piston is communicated via check valve 182 to close a normally open pressure operated switch 184 the closing of switch 184 causes one shot 186 to momentarily energize detent release solenoid 100 to pivot detent element 180 clockwise viewing fig1 to pull roller 84 out the detent recess 62 or 64 and to allow lever 22 and pivot member 40 to rotate back.