"RELEASING DATA,MANUAL OPERATED,CABLE RELEASING DEVICE,LOCATED CENTER OF FRONT OF CASE;LOCKING DATA,2 LOCKS,PIVOTED LATCHES,LOCATED OPPOSITE ONE ANOTHER ON FRONT OF CASE;ENGAGING DATA,ENGAGED BY BEING FITTED ONTO SPLINE PART OF POWER OUTPUT SHAFT OF SERVOMOTOR,RETAINED IN PLACE BY 2 CLAMPS;OVERALL DIM., 3-3/16 IN. APPROX LG,3 IN. APPROXDIA"