If the puncture is small, my local tire shop plugs it without dismounting the tire from the wheel. As one Turanza EL42 RFT had such an issue - but was not run below 30 psi - they plugged it and it has needed NO air in 3,000+ miles.
I carry a 12v compressor so that a minor leak may be refilled en route to service and the tire will (hopefully) not be damaged.
Tom
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