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Re: Spreaders 1983 22' Macgregor
I've never known anyone to measure that distance, and I've never seen that measurement listed among the technical specifications for any boat. That leads me to believe that it's not generally considered critical. If it was, that information would be readily available.
The general rule is that the spreader should bisect the shroud at equal angles (above and below). Most casual cruisers don't really pay much attention to the spreader angle. They eyeball it and they seem to get by. Racers and blue water sailors are understandably more attentive to such details.
Your choices are to either measure those angles carefully, or eyeball them. For many boats, the spreaders don't have much range of movement, so, if you adjust them in about the middle of that range of movement, they'll probably be close enough for the purposes of most casual cruisers. If you prefer to measure the angles, that's even better.