Any question answered...

Token do one that is half the price of the K Edge one. What isn't clear is if it's half as good or not.

What size seatpost do you have? (I may have a K Edge one spare that could fit).

It's for the S2 so need one that fastens to braze on derailleur not a clamp on one.. the Token one looks like exactly the kind of cheap copy I was after :)

http://www.chainreactioncycles.com/Models.aspx?ModelID=58049