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My lbs told me I should try ebay
You should, there's a NOS one on there for half what shops which still have stock are charging.
https://www.ebay.co.uk/itm/Shimano-Dura-Ace-FD7970-Di2-Braze-on-Double-Front-Mech-Braze-on-New-old-stock/323768413644
gbj_tester
sergioflorez
The updated rotor track crank comes as short as 150mm. i kinda sorta want to try 160mm
On another note. I recently purchased a road bike. After two weeks of riding and one charge of the di2, I went to downshift on rings and the chain crapped out a moment after I started going up my driveway. I looked at the chain and thought hmm maybe I can pull it out from under the derailleur where it was stuck. I broke the derailleur and missing a small screw because of my ignorance. My lbs told me I should try ebay as that dura-ace groupset is no longer in production.