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Is it only certain brands of glow plugs that will swell.....or will they all do it, and if so, anything to avoid it?

What causes these glow-plugs to bulge? I replaced mine, and it was strange as driver side were all bulged and passenger side were not. my method was needle-noise vice grips, clamp as close to the head as possible. Then take a 2 foot long flat blade screw driver and wedge between tip of vice...