Maybe this could work well too...
http://www.chainreactioncycles.com/mobile/hope-head-doctor-headset-adjusters/rp-prod911?gs=1&sku=sku5674UK&pgrid=55375185827&ptaid=pla-618491985512&utm_source=google&utm_term=&utm_campaign=PLA+All+Products&utm_medium=base&utm_content=mkwid%7Cs6MGwFUyV_dm%7Cpcrid%7C253998738371%7Cpkw%7C%7Cpmt%7C%7Cprd%7C5674UK
Looks perfect.
Ah no I meant on the drops
Placed the shifters on the bars with the bottom of the lever in line with the bottom of the drops, checked where di2 connector is on the shifters and drilled there.
@Jaap started
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Maybe this could work well too...
http://www.chainreactioncycles.com/mobile/hope-head-doctor-headset-adjusters/rp-prod911?gs=1&sku=sku5674UK&pgrid=55375185827&ptaid=pla-618491985512&utm_source=google&utm_term=&utm_campaign=PLA+All+Products&utm_medium=base&utm_content=mkwid%7Cs6MGwFUyV_dm%7Cpcrid%7C253998738371%7Cpkw%7C%7Cpmt%7C%7Cprd%7C5674UK