The Lisle tool was worth every cent. Took me 1 hour to get all 5 out. Used plenty of never seize on the tools for every step to keep fragments and metal shavings stuck to the tool heads. Made sure to vacuum out the plug holes with some 1/4" tubing after every step. Also put anti sieze on the plugs.
The electrodes look beat up because it had to lay them flat on the table and flatten the tips with a hammer to break them loose from the tool. Other than that, the porcelain never broke through the tips and stayed together.
Startup was smokey but after it burned off, it runs smooth as butter.
A few notes from using this tool:
1. Use plenty of never seize on the tool tips during every step to keep porcelain fragments and metal shavings in check and to keep the threads sharp (I had zero dulling after 5 plugs with this method).
2. 1/4" plastic tubing attached to a shop vac should be used after every step because it's easier to keep any fragments and shavings in check. Better than using compressed air and risk blowing anything down the holes into the cylinder.
3. Take your time and follow the directions. The porcelain will not break through the electrode tip and the tip will not break the porcelain so don't worry; crank it down until you feel plenty of resistance.
4. Press down firmly when threading the extractor into the electrode and stop when you feel plenty of resistance.
5. The electrode tips will be hard to remove from the extractor tool after you get them out. Place the tip on a flat surface and give it a few good hits with a hammer (the very tip) and it will twist right off the extractor tool.