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