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@yoshy
Am I right in thinking the re-radiusing works because of the relationship between the length (tip-tip) of the metal in the centre of the cross-section, and the length of the metal at the edge of the cross-section?
As far as I can tell, due to the slightly smaller overall radius of the mudguard at the edge of the cross-section, the length of metal is slightly shorter.
If you pinch in the edges of the cross section, that shorter length of metal is at an even smaller overall mudguard radius, but it hasn't changed length, so it allows you to increase the overall mudguard radius.
Badly worded braindump