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Yeah good point about the stem.
It seems theres two versions, one for normal stems and one for the tharsis stem -https://www.pro-bikegear.com/uk/accessories/di2-accessories/gap-cap-exp-di2-battery-holder
But how does it work with a normal stem?
edit - never mind, by this pdf, it looks like it doesn't work with a normal stem?
https://www.pro-bikegear.com/_assets/pdf/user-and-technical-manuals/prsi040a.pdf
https://bettershifting.com/component/pro-fork-steerer-battery-holder/
There’s a specific top cap expander thingy Pro make to use with it there