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If the bar wobbles it can be due to two things: slop in the bearing, and/or failure to tighten the locking grub screws.
Those three holes contain three hex headed grub screws as you guessed.they should be tight. The bottom section screws onto DEC ahaft housing and pushes the DEC bearing into its cup. If the bottom section is not tighten up enough it will allow slop in the bearing. I suggest you read one of the NEQ6 tuning guides. It sounds like it needs a tune up.
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