An impromptu but effective punch can be made from the shank of a drill bit that will slip into the hole on the underside. Maybe another soak in penetrating oil or kerosene, then tap the leg of the spring up and out, from below. I'd refrain from heat, which is probably unnecessary. Oh, and definitely what Don says about the drill!
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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