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Yup it’s the VO mount, I think they’re made by someone else in the PNW.
If you’re gonna drill thru a seatpost make sure it’s a forged aluminum one. So Nitto, Kalloy, VO etc. Make sure to countersink the hole and debur it. It might be easier to use a seatpost like the Thomson ones are that are hollow all the way up and just drill out the cradle and rout the cable out the head of the seatpost. Don’t drill thru the side of a Thomson seatpost, I’ve seen a few that cracked from trying to rout canti brake cables thru.
Very nice. Is that the VO E3 mount?
Any seatposts in particular you'd say are better for drilling through the side?