Sharp GF-8585 1980 boombox cassette deck STOP pin broken problems & why No motor speed adjust

No capstan cassette motor speed adjustment then watch vid below = The GOVERNATOR - How vintage DC tape recorder motors work!    • The GOVERNATOR - How vintage DC tape recor...   Sanyo Sankyo Live in facebook as James link below Sharp GF-8585 year 1979 boombox problems it's 44 years old and I try to restore it. 16 March 2024 (20:09) minutes   / 1622644648487436   reel to above   / 2210078072717283   00010 Sharp GF-8585 1980 boombox cassette deck STOP pin broken problems why No motor speed adjust