Garmin Varia mount
thingiverse
This mount was designed to clip to the seat rails under a Specialized Phenom saddle and can be secured further with zips ties. There is also space for a spare chain link (offset pins for AXS flat top chain) with a cover. The design doesn’t include the Garmin quarter-turn attachment, but you can download one here: https://www.thingiverse.com/thing:4315843 I expect the mount will work with other saddles, it works with my WTB Silverado one, but I’ve not tried many. Update: new version (v7) with additional holes to take more traditional type of Garmin quarter-turn insert e.g. https://www.amazon.co.uk/gp/product/B084P2BZ5M/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
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