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@Dave Bevan wrote:

I wanted to check if I can use the other (aft) slot in the spreader tip to achieve the required pre-bend – I assume this will have the same effect as changing the spreader angle aft, but wanted to ensure there isn’t a good reason for not doing it this way?

The answer is Yes, or rather it does not matter which slot you use since you are measuring from the shroud to the mast (or from shroud to shroud).

Perhaps Collin can answer me this:
In all these years it has been unclear to me what point on the mast we use for this measurement. It makes a significant difference whether we measure to the front, middle or back of the spreader bracket. And don’t say “use the pivot pin” because the latest spreader bracket allows the pivot pin to be moved around as well.