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If your tonearm does not have an offset yoke (see photo for example) it is important to understand that raising/lowering tonearm height causes changes to the left/right (azimuth) axis as well.

 

This is one of a few reasons why azimuth is always the last step in optimization. We want any tonearm height changes to be completed so they won't jeopardize ideal azimuth angle.  

 

Should you need to change tonearm height following setting for ideal azimuth angle and your tonearm does not have an offset yoke, this calculator can help determine how much of a change you need to make to your azimuth to get it back to its original position.