Your 2.3mm MPI Prop Adapter Boss Style Source! 
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2.3mm MPI Prop Adapter Boss Style - Product Image
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2.3mm MPI Prop Adapter Boss Style

Fits 2.3mm motor/gearbox shaft, locking on with set screw. 4-40 x 1/4" long socket head fastener and aluminum washer hold prop onto 6mm od 5/16" long boss.
SKU Number: MPIACC324
Price: $4.50 

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