Trim your headsail just right.
This Double Bobbin Inhauler is made of milled aluminum. It's so strong, you don't have to worry about it deforming under high loads. A continuous splice of 1/4" AmSteel is secured around the bobbin. The splice acts as padding for the deck and mast. It has been designed for boats ranging from 35' to 45' - examples are J/111, Summit 40/King 40, Farr 40, Farr 395, J122, Swan 45, IMX-45. In this case, we're outfitting a J/111.
The bobbin is kind to line; it has a smooth surface that won't point load the line. With proper setup, this J/111 will be able to sustain a 4:1 advantage for ease of adjustment.