Mechanical fittings can be applied using a few common hand tools by the mechanically handy DIY sailor, which is one reason they’re popular. The two primary manufacturers of mechanical fittings presently are Sta-Lok and Petersen Stainless, which produces Hi-MOD. Both are located in the U.K., and the products are distributed in the U.S. through vendors like Hayn, West Marine, Defender, and local chandleries and riggers. Generally, they consist of either three or four parts (Sta-Lok has three; Hi-MOD has four), including a sleeve; a cone; in Hi-MOD’s case, a crown wheel; and the terminal (an eye, fork, stud, etc.). If you follow directions, they are fairly straightforward to install, although not especially easy. “The mechanical fasteners are great in that you can terminate and then look inside to be sure it’s formed correctly, so you do have a way of inspecting your work,” Madden says.