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@illy
Measure the distance between the edge of your hand and the middle of the 'Y' in the picture.
Then work it out with the following formula:
l = (2.h + r.cc) / (s.b)
where h is the hand width (in mm), cc is wheel size in (mm), s is stem diameter in (mm), b is bar diameter in (mm), r is the 'rise' on the risers (in mm) and w is the length you should cut the nittos - in cm for some reason!
That's what I use anyway![URL="http://www.centenaryarchers.gil.com.au/images/bow-hand.GIF"][/URL]