The magic number is 1.990" from the forward pillow block bearing to the grove.
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Dummy spar 5
I melted the nut to the washer, figuring it will be easier to retrieve on a completed aeroplane than a separate nut and washer.
It also aids install having only one piece of hardware instead of two.
This pic shows the tip of the starboard dummy spar that is the shape of Mod 78.