4-Max
The Electric Flight Specialists

APC Thin Electric Propellers

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Notes on balancing plastic/nylon props.
Ream or drill the prop to the correct diameter if necessary. Make sure the prop is restrained when drilling so that the prop can not rotate and injure you. Lightly sand the leading and trailing edge of the prop to remove any sharp flashings. Place the prop on the balancer. In most cases one side will drop, this is the heavy side. Rotate the prop by 180 degrees and see if the heavy side drops quicker or slower. If it drops quicker then rotate the prop by 180 degrees again, if it drops slower then keep it as it is.
To balance the prop, sand the trailing edge (not the leading edge) of the heavier side of the prop until the prop balances horizontally. Alternatively you can spray clear car lacquer on the lighter side so that it is slightly heavier. When the propellants in the lacquer evaporates off it should balance horizontally. Check the balance again when the lacquer is dry and repeat the above if necessary.