I'm trying to swap the cranks on our Thorn tandem and would like to know what kind of crank extractor (if any) I need for the job.
Is there a way to tell from this photo, before I've taken it all apart?
EDIT: Photo updated after cap removed (sorry it's a bit blurry). Centre has a thread, is that what I'd screw into and pull?
For example, Thorn list several crank extractors.