> good luck fix a single louver if one breaks. I am facing exactly this repair now. My method is to modify one side of the vane so that a pin can be press fit/

> good luck fix a single louver if one breaks. I am facing exactly this repair now. My method is to modify one side of the vane so that a pin can be press fit/glued into the vane from the side and covered with a glued plug. This can be done in-place when needed. It's not completely invisible but putty and a little brushwork make it almost so.