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This: http://www.framebuilding.com/Bosses.htm
Ceeway also sells paragon machine works, they are in Erith if you want to ride down and have a look and buy.plus ANY framebuilder tbh .. arent you tight with Quirk? Otherwise Winston Vaz, Matt from Talbot the list goes on.
personally I'd decide which brakes, mini V or canti and then look at the manufacturer spec for the brakes, they generally have advised distance (width) between each bosses. I'd go with Paul Minimoto, they dont need that spring hole interface.
Remember V1 is a commodity that you are fucking with. Think of the resell. Hence get a pomp as MVP.
Been in contact with ted waiting to hear back @b&d
@swedeee yeah hunting down the correct bosses is a nightmare Coz I've never used cantilever brakes before, getting a lot of feedback saying to weld a rear bridge and drill the fork for standard calipers but I don't really wana go down that route