Anyone have any idea what this little pin might be?

[e39_touring]

Originally Posted by wpoll

The manual shows two dowels but they are larger hollow dowels that two of the mounting bolts run through...

Yes, this is correct - they're kind of like sleeve dowels. I thought of the starter locator pin, but that's present and accounted for. I haven't noticed any of my tools not functioning due to a lack of a pin like this. I have a few breaker bars that pivot, but no pivoting ratchets. I still haven't cleaned and put my tools away so I'll go through the pile and see if anything looks amiss. Thanks for the ideas!

[e39_touring]

Looked at my tools, and nothing looks amiss there, but I did have another thought on what this is - it looks like it could be a roller from a needle bearing. It looks chromed and hardened with some scoring on it. I still have no idea where it came from or how it ended up in the webbing in the engine block near the oil filter housing...