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Cut out clearance and braze in a curved piece in the cut out section?
Like this but on the outside
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If it is the arms on both sides are not clearing the chainstays I would replace the stays.
They can be reused for something else with longer dropouts later on.If it is the chainrings I would cut out a bit of drive side chainstay and make a yoke from a bit of flatbar
Or get cranks with wider q-factor
PhilDAS
Hulsroy
@Brommers
It turns out that on my new not-quite-finished-but-nearly-there gravel bike frame I have zero or slightly negative clearance between the chainstays and the crank arms. The chainstays will need a wee dimple for chainring clearance, and I'm good with that. However, while my head says to just dimple the chainstays on both sides to allow crank arm clearance, my heart says that's a bodge and I should cut out the chainstays and fit new ones which have sufficient clearance.
Anyone who wants to tell my head that it's right and to tell my heart that it should stick to pumping blood and keep out of framebuilding dilemmas is welcome to say so. Contrary views also grudgingly welcome.