At a top of {HEAD ~ the replaceable sludge can} is a hoisting ring tied with {TAIL ~ a hoisting sling} 
At a top of { HEAD ~ the replaceable sludge can } is a hoisting ring tied with { TAIL ~ a hoisting sling }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL