I searched for "carbunkel" and found it in a book written by Captain John Smith. The word is near the end of the long paragraph:
Horse. To Sling. Slings.
To sling is to make fast any caske, yard, ordnances, or the like in a
paire of Slings, and Slings are made of a rope spliced at either end into
it selfe with one eye at either end, so long as to bee sufficient to
receive the caske, the middle part of the rope also they seaze together,
and so maketh another eye to hitch the hooke of the tackle, another sort
are made much longer for the hoising of ordnances, another is a chaine of
iron to Sling or binde the yards fast aloft to the crosse trees in a
fight, lest the ties should bee cut, and so the mast must fall. The
Canhookes are two hookes fastened to the end of a rope with a noose, like
this the Brewers use to sling or carry their barrels on, and those serve
also to take in or out hogsheads, or any other commodities. A Parbunkel is
two ropes that have at each end a noose or lumpe that being crossed, you
may set any vessell that hath but one head upon them, bringing but the
loopes over the upper end of the caske, fix but the tackle to them, and
then the vessell will stand strait in the middest to heave out, or take in
without spilling.
