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That looks gorgeous, congratulations!
I don't think it's something I can achieve in my first build though.
I can't find the chainstay you recommend on the Columbus website here: https://www.columbustubi.com/eng/4_4_6.htm
Where did you read that they are shaped for brazing on flat mount caliper?Following up on @PhilDAS's recommendation as well, I am guessing a dropout with brake mount is the easiest way to go. In that case, should I still look at flat mounts? Would it be weird to have flat mount brakes on the front fork and post mount on the rear dropouts?
steelest
sbbohr
You can get Columbus chainstays which are specifically shaped for brazing on flat mount caliper mounts - SLF114OV450SX, SLF114OV450DX for the driveside.
Alternatively, Paragon make dropouts with flat mount bits you can braze onto the NDS chainstay (DR2071 in steel for QR rear end - Ceeway sell them). Or you could use Paragon Polydrops with a flat mount insert.
Or you can make it standard and then braze some flat mount caliper mounts directly onto and into the chainstay. It's a lot of work but I think it looks best. This was my recent effort: