If it does not read somewhere from 200-0, you may be able to clean it to get it working.
But you will have to pay close attention to where it's set before you start, get it really soaked in some kind of contact cleaner or isopropyl alcohol, so that the insides get good and soaked, then rotate it back and forth to each extreme several times, making sure it's put back in the original position, this SHOULD bring it back if it's not working.
but if that fails..
https://www.vivatubes.com/vintage-ma...ohm-shaftless/