Well that’s my quandry. This 203 has only around 63000 miles and Basil Moran owned it after sitting in a garage for around 25 years with a blown up engine. He did the motor up and sold it eventually.
I have all the car’s history, so it hasn’t done a lot miles. The unusual wear is a raised edge while this in itself may not be contributing to noise, it could be caused by a collapsed bearing that may be the source of the noise. There is certainly no audible singing detectable. This is why it needs attention and because worm wheels have to be matched to the existing
worm and possibly unattainable, maybe my only option is to fit a hopefully serviceable replacement.