Many alu rims have a small dip at the join. It's normal and not a problem if it's ≤1mm. Trying to get rid of it with spoke tension only makes the wheel weaker due to uneven spoke tension around the wheel.
@Regal started
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Many alu rims have a small dip at the join. It's normal and not a problem if it's ≤1mm. Trying to get rid of it with spoke tension only makes the wheel weaker due to uneven spoke tension around the wheel.