This is with 10 speed. 11 speed requires a bit more care: http://dinosarti.com/blog/2013/5/23/hacking-the-heck-out-of-my-di2-9070
Bum.
Id be tempted to just buy the climbers buttons and strip them down.
Im lazy though.
@Smallfurry started
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This is with 10 speed. 11 speed requires a bit more care:
http://dinosarti.com/blog/2013/5/23/hacking-the-heck-out-of-my-di2-9070