Dave Brown adapter nut is constructed of plain black, CNC machined steel. Use with 3-1/4 to 4" spinners and under. This prop adapter kit tightens the backplate and propeller onto the engine, then using a single bolt-on design, holds and centers each spinner perfectly on its baseplate. Will fit the following engines: All YS 2-Strokes, OPS Maxi .30, Webra .61-1.20.Although it will depend on the thickness of your prop and the spinner size, as a general rule, always use the longest adapter nut possible.
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