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Unfortunately, in doing the measurement noone had taken into account the fact that the tips of the props projected beyond the stub wings.
If by "stub wings" you mean the wing to the fold point, if you were to stop the engines with a pair of prop blades horizontal it would increase the clearance required, but stopping with the props at 45 degrees there would be no such problem (judging from the photos).
I was told that DH were unsure if power folding was required until an admiral said "Oh don't worry about that, we've got lots of sailors who can do it!"