One of the pickup rollers on my Lionel B&O EM-1 articulated Legacy locomotive lies flat, perhaps broken spring, but not a visible flaw. It obviously does not touch center rail causing power dropout. Can these be repaired, though not evident to me, or must be replaced? If replaced, please suggest a source for the part. Lionel provides no help to out of warranty. I had better acquire a few. Are their different modern roller assemblies or is it one size fits all? Thanks
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