Get a quality servo. And that doesn't include Bluebird.
Futaba, Sanwa, JR, maybe KO, maybe Savox are the only brands worth getting. A £10 basic Futaba is a more reliable servo than any of these dirt-cheap brands that claim high performance but give you interference and poor centring in return.
PS Spektrum servos are OK too - the basic ones are rebranded JR, the more expensive ones are rebranded Savox.
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