As Tomo says Kimbrough ones are the best. Fastrax and trickbits servo savers are the same. The off-white coloured one is for sanwa/Ko (23t spline), Red is hitec (24t spline) and the bright white coloured one is for futaba/savox (25t spline)
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Mardave - RCbearings uk - Kamtec
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