Futaba 9650 fits and works great. You can technically use any servo you'd like, but not all will fit in the servo mounts without drilling your own holes. You can also shoe-goo it down of course as well.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
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