If your going to use the Lotus T580 quadcopter for FPV or AP then balancing the props is recommended, in order to minimize vibration. The motors on the T580 did not appear to require any balancing though, as they ran smoothly.

Link to magnetic prop balancer shown:
shop.ebay.com/?_from=R40&_trksid=m570&_nkw=balancer+propeller+blades+wheel+tire+

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