If you observe the TIS, turning the star adjusting wheel can be a SOB, especially if one didn't touch (read remove the disk) in a long while. Visual is very limited, and the star wheel can be hard to turn. Been there, done that.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.