The important part is you ended up with the blue insert for the Athena and your with a Campagnolo approved 90-s 7 speed Synchro (BTW Campy spelled it Syncro and Regina spelled it Synchro) freewheel! To answer your question, according to the graph there are two different color inserts for Chorus depending on which position you are in A=green or B=black. With the Athena (with a Campagnolo approved Regina 90-s 7 speed freewheel), as with you, I used the blue insert. With the Chorus (the same Campagnolo approved 90-s 7 speed freewheel), I choose the B position so I used the black. I now want to try the A position, so I ordered a green.