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From the above the Di2 levers, the rear mech and the Y cable.
The extras I think...
3 x ew-sd50, from the Y cable box, battery mount and rear mech to a 4 way block.
Cables are around £15 to £20 each
The block is one of these at £17I’ve got an insert too and a plug to fill the spare port on the connection box I’ll through in (not much value but a pita if you’ve got to get them).
Alan_tbt
Which bits here would you need to make a 1X 6770 mini group?