The actuator assembly 1 wherein one of said at least one knob is positioned on {HEAD ~ the distal end} of {TAIL ~ each guide rail} 
of
The actuator assembly 1 wherein one of said at least one knob is positioned on { HEAD ~ the distal end } of { TAIL ~ each guide rail }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL