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I ha e a spreadsheet to do it.
The maths dawned on me one night when I sat down to work it out.
I modified spocalc and it works. If any one wants it mail me.
For 1x use 1.5x, 2x use 2.5x and 3x lacing use 3.5x in the spreadsheet. You need to know the centre of spoke hole to hub centre line offset though. This is hard to measure so has to come from the hub manufacturer.
cycleclinic
The DT Swiss online calculator will work out the lengths for straight pull spokes. I used it to calculate the spoke lengths for my wheels with Bitex straight pull spokes and it worked fine.