The ILCA (Laser®) class approved boomvang system. This Harken version offers 15:1 purchase with easy cleating at the integrated Carbo cam cleat.
Older Laser® lower masts may need the tang drilled from 3/16" to 1/4" to accept the lower unit.
ILCA Harken Vang System, from ZIM.
Using Kingfisher rope