The carriage 31 can move freely and the meshing between the worm screw and the tooth wheel is vibration free thanks to the concomitant resistances due to {TAIL ~ the friction} of {HEAD ~ the spring} 171 on the axis 169 and the friction of the tab 173 on the sector 181 
The carriage 31 can move freely and the meshing between the worm screw and the tooth wheel is vibration free thanks to the concomitant resistances due to { TAIL ~ the friction } of { HEAD ~ the spring } 171 on the axis 169 and the friction of the tab 173 on the sector 181
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH