Review on Helicoil 5521-4: 1/4-20 Inch Coarse Thread Repair Kit - Fixes Threads with Precision by Carlos Deuschle

You can't go wrong with HeilCoil for replacing stripped threads. If you care about the weather, you need the HeliCoil faucet in this kit. Yes! You have to buy a special faucet from them. This is a very unique thread size for HeliCoil. A standard drill bit size is used for drilling. For this kit 17/64 bit. It is recommended to use some Loctite or thread sealant when inserting the HeilCoil. I got this to fix a blown muffler bolt hole on my lawnmower's exhaust manifold. I had to use it on my grill a few weeks later when a thick head broke off while changing the burner block and then had to be repaired on one of my benchtop units. Well, thank goodness I had it on hand.