Stubborn safety spring plunger

[jimb16]

You can also try to free it by repeated tapping with a nylon hammer. If ir is rust, that will help break it up and not damage the housing.

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[DaveHH]

in there with the little tube provided to localize the jet. The chemicals are not really harmful to a finish beyond removing any oil in the metal pores which is replenished when you reapply it. That stuff can really break up carbon crud and flush it out. Part comes out clean and oil free. Anyone else have a problem using this stuff?