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@BringMeMyFix
I've just changed the outer ring on my Campag Centaur carbon crank (it was cheap - I'm starting to see why).
The original ring was stamped, and I've replaced it with a machined ring from another manufacturer (due to weird number of teeth).
Now I've stumbled across an issue that I've since read about on the interwebz. The cheapo stamped rings are a different thickness to machined ones, and this causes a wobble in the ring due to the crankset fitting method: 4 spider arms are standard, but the 5th chainring hole attaches directly to the back of the crankarm (bolts straight in).
So, the ring 'warps' 0.8mm towards the bike where it fits behind the crankarm.
I've ridden it, and it seems okay. Needed a bit of judicious front mech adjustment.
The simplest solution for a better fit would be to file away 0.8mm (or even 0.5mm would help) of material on the step+bolt hole behind the crankarm.
Worth it? Bad idea? Do I need someone with a dremel + workshop know-how, or would elbow grease and my flat metal file be enough?
All input appreciated.