The steering unit of the SRX2 is just a pain in the ass. Some servos (for example Kopropo Low-Profile Models) are a little bit thicker (about 1mm) and also wider than normal servos and they don't fit. I was using a different Servo arm (from the TL 22, which is about 1mm shorter) for my SRX2 RM. I tried to do the same trick for my MM but the changed the upper plastic part (made it even thicker) so now even the TL 22 arm is to long. For me there was no other way than grinding some plastic away.
After 2 years I got pretty pissed of by problems like that with the SRX2.
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