New stainless steel guide pin for all TSRF chassis. Allows full rotation of chassis in the slot on narrow-slot tracks. Suitable for Carrera, Revell, Monogram, Atlas, Artin and many tracks with wider slot. Suitable for Scalextric "Sport" if track rails are "blueprinted" as Scalextric track-rails spacing can be uneven. Direct bolt-on or custom installation.

See assembly instructions here