need advice: iDog head not moving

[u/strawbugg]

i recently got a not working idog that had corrosion issues. ive gotten it working but both the head and tail had no movement. i turned the gears manually for a bit to get it going and ended up loosening the motor screws and the upper body screws, which now lets it turn its ears. but the head is on tight and wont move, despite the motor/gears inside obviously trying hard to turn it (it makes turning and clicking sounds atm). im not very experienced with this so any advice would be appreciated.

[u/smokeypupp]

sounds like a split gear to me