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@Cranky
Cheers.
I measured the ERD using some spokes with 12 mm nipples in opposite holes. First I measured nipple end to end and added 24 mm. Then I used two spokes cut to 200 mm with 12 mm nipples and measured the gap between the spokes and added 400 mm.
Both measurements were within 1 mm and I repeated around the rim.
Am I doing something wrong to get 605 mm? This leads to spokes 2.5 mm longer and which I'm concerned could lead to problems in the build if my measurement is somehow wrong.