The spring 23 is dimensioned in dependence on the weight of the upper frame, such that {TAIL ~ the work plate} can be raised and lowered effortlessly by {HEAD ~ hand} 
The spring 23 is dimensioned in dependence on the weight of the upper frame , such that { TAIL ~ the work plate } can be raised and lowered effortlessly by { HEAD ~ hand }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD