In this way, the bellows covers the upper portion of {HEAD ~ the canvas belt} on {TAIL ~ the upper side} 
on
In this way , the bellows covers the upper portion of { HEAD ~ the canvas belt } on { TAIL ~ the upper side }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL