Mazzucchelli crank journal

I fitted a Mazzucchelli crank to my VBA and had a rattle in the engine at idle since. I have now discovered that the journal on the crankshaft for the flywheel side bearing is a loose fit. Further inspection shows that it only measures 24.81mm and the bearings internal diameter is 25.00mm. The journal is perfectly round, but under size.

Any recommendations on what to do about this?

 

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SIP part number is 45135000