I've used the cheap string plugs kits many times in the last 73K miles. Even had to plug two holes at once in a front tire due to a staple. Every tire I've plugged I've run down to the bare minimum tread, never had an issue. I'm currently running a plug in my rear tire from a nail I picked up at less than 5K miles, that tire should go to 25K miles like the previous ones did.
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