Originally Posted by bostontrevor
I don't have a solution for the problem, but there's no need to stress relieve a radial wheel. In fact, it can't be done.
Stress relieving involves relieving the stress at spoke crossings. Since the spokes don't cross, there's nothing to relieve.
A new spoke (and a recently tightened one) has regions of high and low stress inside and at the elbow. Squeezing pairs of spokes causes the high stress areas to yeild slightly, resulting in lower stress throughout the spoke. A high stress region on a spoke its more susceptible to fatigue failure. I first learned this from the book "The Bicycle Wheel". If you Google it, many sites will say it is important, but don't explain why, or give erroneous reasons.