US Patent 7086803 Thimble

A thimble providing a first convex surface about a first axis and a second convex surface about a second axis, the first and second axes being substantially perpendicular to each other and the first and second surfaces being opposite each other, the thimble being such that a first length of elongate material can be wrapped over said first convex surface and back on itself to form a first loop around the thimble and a second length of elongate material can then be wrapped over said second convex surface through said first loop and back on itself to form a second loop around the thimble.