Thanks @hippy and @danstuff. Look like I’ll stick to the under stem option and add a mount. My seat post doesn’t have a suitable hole and I the stem option is tried, tested and a good deal cheaper.
Something like: https://www.amazon.co.uk/M-Part-6mm-Spacer-Di2-Junction/dp/B01N6CQJ9G
I use the Fouriers version of that as it's available in -6 and - 17 degree versions and in different lengths.
@hippy started
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Thanks @hippy and @danstuff. Look like I’ll stick to the under stem option and add a mount. My seat post doesn’t have a suitable hole and I the stem option is tried, tested and a good deal cheaper.