Thanks. Not so easy to remove bearing. Guess the complete left side must be removed. But should be possible.
The manual I have is for model Park 30 issued January 1 1949 and cover serial numer with serial number 1730-2101 and up.
My label show two numbers, 63002 and 24883. I guess my park 30 is from early 60-ties. But no other manuals can be found other than the manual from 1949.