Have had multiple tires plugged the way you describe.
Never had them patched on the inside or balanced afterwards.
The weight of the plug cord is seemingly as much a piece of gravel caught in the tread so I am dubious it is enough to warrant balancing.
Virginia allows plugs in tread only.
If you are doing a regular tire rotation and inspection, odd wear due to an imbalance should be apparent ... if you do not feel it driving first.
After 60+ years my skepticism has only increased.
Of course the surgeon wants to do surgery.
So take an aspirin before having the brain removed for a headache.
Cost of tire ... miles left on tire ... cost of patch ... cost of tire store exercise ... the numbers do not lie.
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1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)
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