A5266 Mainsheet Jammer from Allen Brothers is very simple solution to a age old problem. The problem with a swivel mainsheet block that is centered on top of the swivel base is that the cleat doesn’t automatically aligning itself, but rather stays on the old side when you tack.
Allen has come up with a simple idea of moving the block outward from the central. By doing this the load on the block pulls the block in line with the load and hence the cleat ends up on the windward side ready for use.
The new Mainsheet system, is being launched at METS in Amsterdam. The products will then become available in early 2018.