The insert that Joey shows will work on most other threads but not the Cog which is 7/16x11.
The reason that it won't work is because the threaded section of the insert (Unique Products) is 1/2x20.
That has a minor dia. of approx. .413 which is smaller than the major dia of the pin.
What's likely to happen is that the 7/16x11 tap will take out 1/2 of the installed insert.
The 1/2x20 threaded section will be gone and what remains of the unthreaded section will have
a wall thickness of .0315".
Consider also that the Unique insert is about 1" in total length. The Cog pin is longer than that.
Plugging & tapping is the way to go, I just wouldn't use that insert.
Atlas has the 7/16x11 tap in stock.
http://www.cuestik.com/store/product.asp?DEPARTMENT_ID=129&ITEM_ID=5824
That info is a printer for file/ Thanks