Defective Threaded Inserts. When I tried to install they skipped threads. Tried several missions. I even turned the faucet several times thinking it might be a burr. The only reason I ordered them was because an ORIGINAL screw coil repair kit was out of stock. Big mistake. Now I wasted two hours of my time and I still have to wait a week for a helicoil kit. By the way, I worked as a locksmith/mechanic for over twenty years. I've installed hundreds of helicoils. This kit is crap.
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