....since you can get to it easy just take a punch or screw driver and hit it on the edge which will make it turn so the edge if facing you, then take a screw driver and it'll pop right out.
......I once rebuilt an engine and when I stuck my fingers down inside the block, after taking the freeze plugs out and vatting the block, I found SIX freeze plugs inside the block. Lots of time mechanics would just knock them in the block depending on how hard they were to get to.....but for me, I don't want anything restricting the water flow!!!
