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