Tools needed to remove a freeze plug:
-an iron mallet
-a sturdy bolt or something with a tip of about the same width. The bolt works great.
-pliers. I used water pump pliers and it was easy enough.
Hit the freeze plug on one point near the edge. This will drive this side in and the freeze plug will become free. pull the plug out with the pliers.
To insert the new plug back in:
-sheet metal hammer with round head.
-iron mallet
place the freeze plug where you want it to go in and put the sheet metal hammer inside of the freeze plug. hit the sheet metal hammer with the iron mallet and drive the freeze plug in little by little. Turn the sheet metal hammer to drive the freeze plug in on different points around the plug.
I was told that a socket that fits inside of the freeze plug works well, but the one in the pictures (29 mm) fits tight, as opposed to the sheet metal hammer. it is difficult to insert the plug with the socket shown.
