KOM Cycling for Garmin Varia Mount Tail Light Models Including RTL515, RTL510, RVR315 Featuring an ATOP Dial for Security - Varia Seatpost and Under Saddle Mount - Fits Most Seatpost Sizes (Black)

I had been waiting ages for these to come in stock and was massively disappointed when it arrivedYes there is less chance of it dropping off than the standard Garmin seat post mount that comes with the Varia. Also if you have a D shaped or aero seat post this might work wellHowever for a standard round seat post it is absolutely rubbish. There isn't enough friction so the mount swivels round at the slightest pressure. This could probably be solved by putting in a shim, however I wouldn't expect to have to bodge it with a £40+ mountWould definitely avoid. Nice idea. Terrible in practice