Hi, I recently found a 1928 Bakelite Rolmonica that was my Dad's.
The bottom knob won't turn and the inside of it is worn. I see from
the upper knob that it's supposed to have a little raised edge.
I'm wondering how to fix it so it will play? Any ideas would be
much appreciated!

Eileen Manglass 

 [ The worn end of the bottom knob
 [ https://www.mmdigest.com/Attachments/22/01/09/220109_120339_3E5BED1B-1B29-4942-A54C-FC3424856809.heic 

 [ HEIC stands for High Efficiency Image Container. The format is
 [ an updated variant of the High Efficiency Image Format (HEIF),
 [ traditionally used by Apple across its mobile devices. Ref.
 [ https://www.adobe.com/creativecloud/file-types/image/raster/heic-file.html 
 [ -- Robbie