So, does it still stall when motor is on it or not?
If all gears are OK, maybe it is just too tight meshing at motor shaft?
If you do have broken gears, it should not be hard to determine the overall reduction ratio (by counting the teeth of each gear).. from there, perhaps something suitable could be found.
I may have something in my drawers.. just let me know the reduction, and shaft diameters/coupling
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