I installed my BB the other day - per the instructions. Installed the right cup with the aluminum spacer, then the left cup, but there was an "extra" part - a plain looking aluminum tube with machined ends. This was inside the aluminum spacer when I unpacked it. I left this piece out of the install, but now I am thinking it might have belonged - the machining is pretty good on the inside of this piece, more than I would expect for something that was used as, say, a spacer used in shipping.

Thoughts on this?

JA