How to chase helicoiled threads?

Trevor B said

Thanks All -
I think I'll just pull the helicoil out and put another one in as I have 5/16 on hand (after chasing the hole with the correct tap). Definitely going to need some sealant in there, but that's always the case for those holes. The threaded inserts look pretty cool and I'll have to try some in the future. Pricey though.

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OOP'S sorry I missed these last post I have not been on here for a day or two, not sure where you pricing them from but if you already have the drill and tap, they are actually quite cheap even up here in Canada where we pay three times for almost everything you guys do they are only about 2 bucks each at my local fastener store, maybe you are looking on line, if you have a specialty fastener store near you they will have them, maybe by a different name, I think they call them " griprite's or grip inserts" at the store I get them from, also a bit of sealer on the thread takes care of any leaks I use them on outboard gearcases all the time that are always under water...no leaks!