It could easily be that with some servos it will fit and with some it won't. Servos are very different these days - the distance from the end of the output spline to the mounting tabs can vary by a massive amount.
I've run the kit plastic one. In fairness I did break a gear in a servo however, but it is a fairly old servo and can't remember the last time it came apart - if at all!!
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Matthew White
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