Rebuild kits exist for 1955-65 Chevrolet generators
https://www.danchuk.com/ItemForm.aspx?Item=1843 so perhaps for the earlier ones too?
One source says "not currently available" for 40-54 generators
https://www.chevsofthe40s.com/detail...ts_Etc_41.html
Googling "6 volt delco generator rebuild kit" produces quite a few results, it seems to matter what the part number for the assembled generator is....