Originally Posted by
3alarmer
...if it won't clean up with a tap to where it will hold a derailleur securely, this is your next step and best option.
I don't know what a "dropout saver kit" is, but a helicoil in this spot is a snap to install and will last forever or until someone breaks the hanger.
And they don't cost anywhere near $70.
The "Dropout Saver Kit" has the clearance drill bit and a number of the internally threaded insert bushings so it's intended to repair multiple bikes. Hence the cost.
A single bushing is only a few dollars and the needed 15/32" drill bit is in any 1/2" drill bit set or available at any hardware store. As fietsbob noted, the bushing has a hex on the inside of the dropout that you hold to tighten the derailleur's mounting bolt.