You may be able to repair with 3/16" brass tubing like I did in the jack rebuild article posted above. Given that the original doesn't seem all that robust, the result might be quite reasonable.
Here's a possible method:
- Carefully drill out the old stud. Go slow and do not let heat build up that might melt the plastic, and fanatically police any metal shavings.
- Cut a piece of brass tubing to the appropriate length.
- Find a washer that solder will stick to. Drill it out to the O.D. of the brass tubing. Solder it onto the end of the brass tube, leaving a generous fillet. Also solder on a wire pigtail for later connection to the PCB.
- Epoxy the assembly into the plastic post. Solder the wire to the connection point on the PCB. Plug the end of the brass tube with epoxy or something to prevent FOD from entering the meter.
- The meter should be useable at this point, but for aesthetic purposes, you could get one of those plastic plug inserts from a set of cheap probes, prepare it and glue it to the tube from the front, to make a replacement red inner shroud.