Be very careful drilling or tapping that hole, its open to the inside of the engine (you literally see the timing chain once you remove the arm bolt).
This is why the fsm also instructs to use thread sealer to prevent oil wicking through the threads.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)