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SRAM's plastic tool will set the height, if a SRAM cranks is used, but it won't stop the FD from rotating out of alignment when the clamp bolt is tightened. Always recheck that the alignment marks are parallel to the big ring, after the clamp bolt is tightened. Mine never would be unless I set the marks crooked to start with, then let the rotation bring the marks into a parallel position.
The plastic tool doesn't fit my GRX cranks, so I do it all by eye. I never use a wedge either.
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