The vang is made up of 29 mm blocks in an 8:1 cascade.
Vang control lines lead to turning blocks and cleat to 150 Cam-Matics® on
each rail. IC booms often break where the vang bail bolts through the boom.
To solve this problem, tie a 29 mm block around the boom with Spectra® line.
This keeps your boom intact and provides you with a strong, lightweight vang