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Got another option to play with; heat gun later. Maybe.
Not on the idle screw location. Precision sized tapered hole and matching needle. You’re actually getting down pretty close to watchmaking level precision. It’s called a “screw” but its not really a screw. people call it a screw because you adjust idle mixture by turning it in or out. Its actually a tapered needle to meter fuel through a fixed orifice.If all else fails, it might be possible to drill out the screw, tap a slightly larger hole and machine a new screw/valve? Or install a threaded insert and replace with an OEM screw?