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The best method to correct a rocking soft foot condition is to shim the soft feet according to the air gap measured. This approach directly addresses the issue by compensating for any uneven contact between the base of the machine and the foundation. When a machine has a soft foot, it means that one or more of its feet do not sit evenly on the base, leading to misalignment and operational issues.

By shimming, you can achieve a uniform contact across all feet, which stabilizes the machine and reduces vibrations. Proper shimming ensures that the air gap is eliminated, and the machine operates effectively without the rock or wobble that comes with a soft foot condition. This method is also more precise, allowing for a tailored correction based on the specific measurements taken.

Other methods like loosening all feet and realigning may temporarily mitigate the issue but do not provide a permanent fix. Replacing the soft feet entirely would involve more extensive work and may not be necessary if shimming can effectively resolve the problem. Simply increasing torque on the bolts could lead to further misalignment or exacerbation of the issue without addressing the root cause of the rocking. Thus, shimming is the most effective and straightforward solution for correcting a rocking soft foot condition.