@Dylan - all Crank Bros pedals are supposedly 'rebuildable'. I wish I didn't know this, it would save me trying to figure this out.

@Freezing - I think you're probably right, but I can't figure out how to get the end off without using brute force.

Crank Bros should put PDFs of their instruction manuals on their web site. I'm going to order a rebuild kit if they don't answer my email early next week. Once I've got the answer I'll post the rebuild procedure here for the record.