Auto/manual switch stuck on Takumar 105

[pierods]

My Takumar 105 super multi coated has a stuck auto/man switch (stuck in auto). I tried moving the aperture gear and pushing on the pin coming out of the back of the lens but the switch does not move.

https://lens-db.com/asahi-super-multi-coated-takumar-105mm-f28-1971/

 

[OAPOli]

SMC lenses have a tiny pin around the lens flange that locks the A/M switch. When the lens is off the body you need to manually press it to unlock the switch. Maybe that mechanism is faulty?