The Stearn Dynafurl One is a furling system made by adding a halyard swivel and a drum and drum cover assembly to a Stearn Twinstay One . System Sizes are identified by Rod Width. To determine your system size, measure the narrow dimension of the forestay rod. We recommend using calipers or a micrometer. All other parts are available.
Rods are out of production, but other parts are available.
With a little easy maintenance and occasional bearing replacement, your Stearns System should last several lifetimes. Earlier systems used 3 bearings per end, newer systems used 1 stronger bearing per end. The only way to tell which type you have is to disassemble them. The two Bearing types are not interchangeable, nor are any other of the Terminal End components. Earlier systems used the Tapered Terminal Ends.