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If you are only looking to replace the IMSB, you do not have to remove the 3rd tensioner. If your plan is to replace it, then go for it.
8 mm dril bit for the pulley is the way to go. As James said, you are not far off.
In fact, on you second picture you can see the boss behind the pully.
Look like you need to turn it a notch counterclockwise.
Good luck.
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