This is for getting the outside plug off and your outcome may be different.
1. Slide a 1 to 1.5 inch flat washer into the slot (need a washer with a decent sized center hole)
2. Put a long handled screw driver through the washer hole and use the screwdriver as leverage to turn the washer and remove the plug
Just discovered it as I was about to buy a timing plug wrench for $30. This probably isn't new but didn't find it on the board while searching.