Introduction
If your Holy Stone HS720E isn't performing well (unstable flight, undesired path, etc.) it can be a result of poor propellers. The propellers could be physically damaged, obstructed, or even secured incorrectly.
Tools
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Remove the two 1 mm screws securing the propeller using a Phillips #00 screwdriver.
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Remove the damaged/malfunctioning propeller.
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Conclusion
To reassemble your device, follow these instructions in reverse order.