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This is a set of ten HO scale nose gyralites commonly used by NP, Frisco and Apalachicola Northern.
To install gyralite, soak in Bestine for 1 hour to fully remove all wax support material. Cut hole into nose of locomotive adjust for a snug fit. Install either 1.8 mm (.070") fiber optic for a lighted gyralite or MV lens (600-603) for a non-lighted installation.