Sadly, this looks familiar. The spring creates roller force on the rail, and it is now weak (and perhaps the cause of the much sparking) because at a moment of short circuit, the spring carried the amp load and lit up orange like your kitchen toaster. When it cooled, it had lost much of its temper as seen by the discolored turns of the spring. Both trucks will somehow require spring replacement. Your well designed and applied electrical tape insulator should effectively prevent the short.
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