I've done this before with a ratchet crimping tool from work (cost around £150) and new blades and connector housing from most model shops or ebay. You can get cheaper tools but i'm not sure how good they are.
I've also done it by opening up the servo and de-soldering and re-soldering the wire directly onto the circuit board and can tell you its way easier to change the connector.
One word of warning though if its a savox servo, they will not honour any warranty regardless of what the problem is if the wire has been shortened.
Tony
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