 It is not necessary to have great leverage as the adjustment is made at a point in the manoeuvring of the boat when the rigging is slack.The significant point is that the lever should be designed to take up the required amount of slack.It is possible to arrange a Highfield lever to work two backstays or shrouds by mounting the lever transversely so that it is thrown from side to side rather than fore and aft, tensioning the rigging on one side of the boat as it relaxes the other.