Check out Hitec servos. They're pretty popular with most people. The HS-55 is way too small for the RS4, but it's a direct fit for a mini-t. The HS-56 is about the same. I've been running a Futaba S3003 (1/10th) servo in mine since day one. I've never broken a gear.
What servo are you running now? Have you tried getting replacement gears for it? They're easy to repair.
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If it don't fit, force it...If it breaks, it needed replacing anyway.
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