Hello,
I would like to buy a thread repair kit because the threads often fail on weekends, and it's always difficult to borrow something then

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Okay, here's the translation:
'Now my question: Which would you recommend, Helicoil or Time Sert from Würth? Has anyone here worked with both, so that they can offer a comparison?'
In terms of price, Würth is considerably more expensive, but that doesn't necessarily mean it's better.
Thank you.
Regards,
Pure.