I've had a few posts here about my, new to me, 86 Cat 27 Tall Rig. This have mid boom sheeting. It does not have a vang. However, is it really needed? It has 3 bails on the boom and the last one is about where one would mount a vang to the boom. I have seen pictures of other C-27's with mid boom sheeting and a vang. I'm sure opinions will vary.