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Because a hollow mill has a balanced cutting action, it will try to center the part, thus moving the part. When the tool is stationary, as you reach the end of the cut, near the spindle, the part will no longer move to let the stock get into the center of the hollow mill. the tool will cut small at the end of the cut and leave drag marks when retracted. Misalignment can be proven to a customer if the tool is stationary by removing two opposite blades. depending upon whether the misalignment is horizontal or vertical moving two opposite blades will correct the misalignment. By turning the tool to the perfect spot you should be able to cut a perfectly straight part with two opposite blades.

If the tool is rotating but misaligned you should get a correct sized part eccentrically off center. You can still have drag mark problems and a slightly tapered cut, even when the tool is rotating, if there is part deflection or movement. In that case, drag marks should appear only on one side of the part.

If all blades are not ground alike, this can produce the same effect as misalignment if the tool is stationary. If the tool is rotating with blades that are not identical, the tool probably cuts slightly oversize with one blade doing all of the cutting.