Originally Posted by
RookieRoadie
Funny thing is that's the only type I've ever seen
What sort are they, out of interest? In the ones I linked to, the black bit that screws into the crank is in fact separate from the bolt, like this:
To remove the black bit, you'd need a pin spanner or something. I don't know if there are any special tools other than that. But your crank is square taper, correct?
The bolt has its own cover/cap attached to it and the black bit (extractor) is a separate piece that goes inside the crank. According to the spec, it is a square taper and from what I've seen it appears so.