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WimVDD
@Momentum
The downtube is mainly in tension (ie being pulled when you sit on the bike) - thats how Slingshots can replace the tube with a steel cable and not collapse. So I think that crease will be fine since it isn't under compression. I'd ride it and keep an eye on the crease, but that's just me.
I wouldn't spend more money on the frame though or cover up the defect which would stop you monitoring it.