The motor needs to be removed to disassemble the gun and get to the gearbox to shim it. If you're not careful with where you place the motor, the magnets can suck shit like small screws or shims inside and jam between the armature and the magnets. Happens a lot when techs put the motor in the same bin as the other parts when they take the gun apart.
Do note though that unjamming a motor in that manner can cause serious damage to the windings.
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