Not had the handles off - which bit wears? If it is a cylindrical pivot point, would it be possible to 3d print with a brass or bronze sleeve part preplaced to include in the finished article as a wear surface?

This bit that wears is a horseshoe shaped notch if you like.
There is a pin that sits within the horseshoe bit which probably wears but the catching of the handle is caused by the horseshoe notch wearing.
 

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