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Measure center to center on both the triple tree bolt holes and on the risers. See if there's a difference. If you can get one to thread easily, then there shouldn't be an issue with the other side. Have you tried starting the opposite side first to see if the problem follows you??
Sure enough, the bolt holes were not 3.5" center to center(on the bars). Off by 1/16. This sucks, hoping the bar company makes this right. Now I'll have to redo all the internal wiring, no bueno.