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Sorry to hear that, hope you get her back.

Have you searched kantun s tuning? There’s decent info on sailboats RC website

Here’s what mine is like. As I understand it the thumb wheel allows you to raise and lower the eyelet to suit the conditions. However most boats don’t have any such feature so you could say it’s irrelavent, set it up and forget it! Previous owner of my boat did just that, so do I !

Zonko is quite quiet on this feature. The three rings are for A B and C rigs respectively front to back and he says you can tighten or loosen the cord to suit conditions. TBH don’t think it counts for much! Wouldn’t spend too much time on it !

I have reasonable cardboard templates, happy to trace out and send on.....