A wool-stapler is a dealer in wool. The wool-stapler buys wool from the producer, sorts and grades it, and sells it on to manufacturers. The expression wool-stapler fell out of use during the 20th century, see the external link below. Staple in this particular context means a market. Prior to the 17th century Staple was also a particular type of m...
[n] - a dealer in wool 2. [n] - a person who sorts wool into different grades
woolsorter noun a person who sorts wool into different grades