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Nice machined piece. The base part (mating the collet) has bump pattern to increase grip on the prop, unfortunately no washer to put between the prop and dome part. Mine came in alu colour. No nut included as on the picture, only the dome to thighten the prop.
A nice feature is that the collet axle as a hole at the end to attach a spinner with center screw.
A 2mm screw is too thin and 3mm doesn't fit, so I guess it should be 2.5mm (not tested). Unfortunately the hole is not concentric, so you can better forget about using it as you'd have a hard time to balance the whole thing.
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