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On a lugged bottom bracket it is a good idea to drill a hole underneath, water can't stay in the chain stays as it will drian away .
But on a luggless bottom bracket the water or mousture at the end of the tubes will rust if you don't fill the air holes or dill them big enough for the water to drian away .
Another problem is water baths, to get the flux off , after brazing,! The best way is to shot blast the flux off , !
skalliwag
Thanks for replying. Finding this really interesting.
What would you do on a lugged frame? The hole at the bottom bracket end of the chain stays would be too large to close up no?
And would you suggest closing up air holes on frames built with them? Actually, I guess it’s pointless dealing with the air hole at the dropout when there are holes between seatstays and the seattube and these would be impossible to access to seal on a built frame.