take a full spoke of known length, put two of them in opposing holes on the rim and screw nipples down to where you'd want them to end up and then use a caliper to measure between the bends as per this image and add that to 2 x the spoke length
I do this.
The "screw the nipples down to where you want them" bit, spoke end flush with the top of the nipple?
Same here
Yeah.
@M_V started
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I do this.