External BB spacers - how many??

Monowai
Monowai Posts: 329
edited May 2008 in Workshop
just bought an external BB off ebay and usefully it comes with no instructions! :evil:

The problem is that there are 3 plastic spacer rings between the cups but not sure how many I should use. I'm installing it on a Look 555 carbon frame, which I assume has a 68mm shell.

Any tips :?:
Cake makes me happy

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