Sean-bumble-bee
Core User of DJI
Flight distance : 15997 ft
United Kingdom
Offline
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SEAL the motor with tape etc. before any cutting, you do not want steel swarf getting into the motor, one tiny piece of swarf could jam the motor. If you even so much as nick the blade hub scrap the blade. The hub bears a lot of stress and a nick could grow through fatigue.
Personally I think I would crush the blade hub to the screw with mole grips and use that grip the break the screw loose and spin it out.
One other idea just occurred, work a small drop of super glue into the gap around (and under?) the screw head, let the glue set and then see if the glue's grip is sufficient to use the prop to undo the screw. Scrap the blade if you try this, I do not know what the glue will do to the plastic.
If you scrap or destroy one blade destroy its companion and use two new blades to replace them
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