One thing I did, when I was tight on funds, and depending on application, was to plug the hole with new plastic. Get the old part spru, shave of thin slices of the plastic, cut them up so they were very small, put some inside the hole, heated up a piece of 3mm steel rod (which I think was an old 2.5mm Allen driver tip that had the tip ground off), and inserted the rod to fuse the plastic shavings and plastic part together and repeat untill the hole is plugged. Once plugged, drill with a 2.5mm bit and re thread with a new screw. I know it's not great but it worked for me, hope that helps.
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Yokomo BMax 2
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