Yes 9g ds425m and its for my 450, to try and lock down my tail as I am getting drift I think due to cheap tail servo, ok for the person who owned it before me as he flew in rate mode all the time.
Small arm has one right at the end and one 3 mm further in,
Oh plus this servo is twice as quick, so should be able to keep up with my reactions, lol hehehehehe
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That's about where it is on the servo that's in mine already, just no info in the manual, but I guess it's depends on what servo horns you use