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Are you referring to the post that the point arm pivots on, or the post that the spring is anchored to? The pivot post is riveted onto the insulation pad, and if you look on the underside there isn't much clearance between the rivet tail and the plate. As chrs1961815 mentioned, if that post is loose, or if the rivet was bucked incorrectly, the rivet can make contact with the plate and short it out. If you are talking about the post the spring anchors to, you have to be careful when you attach the wire on the bottom that the flag or connector touches only the insulation and it does not make contact with the metal of the plate.