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If it's only handle bars that's simple. Just loosen the bolt that holds the risers in the upper triple tree. Then loosen the top of the risers that hold the bars. Then get everything where you want it and re-tighten the top of the risers first then bolt on the upper triple tree last.
I'm assuming by "tweaked" you don't mean "bent." Bent is different than out of alignment.
If it's only handle bars that's simple. Just loosen the bolt that holds the risers in the upper triple tree. Then loosen the top of the risers that hold the bars. Then get everything where you want it and re-tighten the top of the risers first then bolt on the upper triple tree last.
I'm assuming by "tweaked" you don't mean "bent." Bent is different than out of alignment.