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hi im kevin most garages will have the tools to do this nowadays you can buy sparks plug thread repair kits
I have located a mobile repair service in wentworth falls, that do major repairs .
I would give them a call as this is a basic procedure and they should be able to handle it
let me know how you make out!
here is the link:
I would give them an email an ask for them to send a tech that has heli coil experience and not send one that hasnt done one before. Im actually suprised that the guy didnt do them as It is a pretty basic and common repair and shouldnt require a "specialist"..have you thought about trying to do it yourself? there are quite a few videos instructing how to do them.