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It sounds exactly like your battery is too weak.
Throw a 9.6v large on there and it will work again.
If it worked with this same spring before, you have done something to make the gears tighter that makes the motor have to work too hard to move the gears. Improper shimming (what everyone has said about putting screws in first to see how well gears spin freely) probably. Or your current battery might just be on it's last legs and doesn't have enough discharge rate to turn your motor over at the very peak of spring compression where the most torque is needed.
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SHÖCK
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