RIO Cranky

It's a quick, convenient fly line spooling/storage station that includes one RIO Cranky (featuring ergonomically shaped handles for a smooth, comfortable operation) and a RIO fly line spool.

Simply wind the line off the reel through the rod on to the fly line spool that is provided, unloop the line from the backing, then loop the new line to the backing and wind the new lone on to the reel. With this technique anglers will not need to restring the rod. In addition, with a few extra fly line spools, anglers can build a convenient fly line storage system and library.

Info form the Flytackle Blog