This 57 mm Carbo Block is used for the mainsheet as the mid-boom block. This block also attaches to the rudder if you are not using a 3:1 system, but rather a 2:1 system, which is the standard rigging for the new racing Flying Scots.
This block is also used as the jib sheet fairlead block on the slide for all new Flying Scots.
Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. These small, compact blocks have very high working loads for safe, easy trimming.