Very informative. When I get my new garage finished I'll be making one of these line spoolers. That way I can move my operation outside rather than using my vastly more primitive line spooler and dealing with 2 cats that think playing with a 3700 yard spool of Trilene Big Game is a wonderful thing and a wife who refuses to find any humor in the whole deal.
BTW, both Slim Jim's and helpers like yours give me heartburn.