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