Two levers pivotally mount {HEAD ~ the pressing roller} on {TAIL ~ a housing} which, in turn, is detachably mounted on a support, the housing being extremely flat and bounding a chamber which has an open end 
on
Two levers pivotally mount { HEAD ~ the pressing roller } on { TAIL ~ a housing } which , in turn , is detachably mounted on a support , the housing being extremely flat and bounding a chamber which has an open end
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL 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