Rehmbo,

McMaster-Carr sell a number of flanged sleeve bearings. See if one fits; metric bits are harder to come by, the Nacra bushings may be right for those pintails, may not be.

I've had good luck 3D printing bushings but they need one or 2 tries. I also drilled out my older Nacra castings to the new bushing size which worked well.

The other temporary fixes I've used are electrical tape or a step up PTFE tape.

-Sam