If it's only 3mm, why not try chamfering the outside edge of the rollers a bit?
Mine is a bit wide as well. Next time I have it off I plan on chucking the wheels up in the lathe and taking the edges down a bit.
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Andy Compton, PhD EE
RV-10 - #41414 (building)
RV-9A - N643AC (built,flying,sold,missed)
My blood and sweat, the Wifey's tears
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