that's why i take a lot of photos along the way, also; when i change the timing chain covers i've used a piece of cardboard where i poke the 6mm (10 head) bolts in the same pattern; they have like 4 sizes so it's definitely a challenge to get back into the right holes

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)