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Yeah, you need to push it in like you are really trying to hold it seated against the head. You can't, so it will pop out with every fire, and usually in about 5 seconds it comes out. A little engine heat, and rev(2500ish) works well.

Yes, but I only do this with a whole GP(not a broken one). Gloves, glasses, and hold on tight. Picture pushing in like the vicegrips are a screwdriver handle. Push in as hard as you can(you can't overpower the combustion). This is like knocking it out with an impact punch, from the inside.

It does if you don't get it stuck(or broken off) in the hole first. I've done it many times. I use vice grips on it and push it in as hard as possible. The combustion pops it out and I push it in, after a few repetitions, it will come out. You can rev it up a little to help this process.