Phil makes a point of handing the parts back to people (as is completely right!) So he doesn't have one.

Nippymog, if you are happy to part with the sprocket I'd be delighted to take it off your hands and sort out the required beer tokens. I'm not quite cut off from the Internet stuck on the SSCV Thialf for the next couple of weeks so communication is tricky and can be a bit slow.
Cheers
Calum