Idea is sound but the implementation can be better.

Also more simple implementations are available.

Do you remember my rotation system Gill ?

I now have a pad eye on the end of my rotation arm and a cleat on the arm. Here I can fine tune the right upwind trim. With the maincleat I can engage or disengage the rotation to pre-determined settings.

Simpler, cheaper and just as effective.

Several other systems can be thought up. Phill has one for when the rotation arm is underneath the boom.

Wouter