It depends which core plug it is, some are difficult to get at others are easy. You can punch the old one into the block then tap a new one in or there is a special tool (which I have) to remove totally. When putting in the new one it is a good idea to use some grease or lubricant to help the new one in square.
Good luck
Ressy
December 2009
Automatic Answer
We may have found other answers which could help you.