When a chain saw is placed on the chain saw mounted and moved towards {HEAD ~ the trunk} of the tree along {TAIL ~ the guide bars}, the tree is cut to a position determined by the stop mechanism on the guide bars 
When a chain saw is placed on the chain saw mounted and moved towards { HEAD ~ the trunk } of the tree along { TAIL ~ the guide bars } , the tree is cut to a position determined by the stop mechanism on the guide bars
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH