Inner ball shooter assembly high tension .042 inch diameter wire compression spring with red coating.
Inner spring coil diameter is .406 inches and overall length is 5.62 inches.
Reference:
Data East / Sega / Stern spring tensions & color code:266-5001-02 red .042 inch wire266-5001-03 black .037 inch wire266-5001-04 green .035 inch wire266-5001-05 blue .031 inch wire266-5001-06 yellow .047 inch wire266-5001-07 orange .038 inch wire266-5001-10 purple .040 inch wireBally (BLY): 10-148-2Williams (WMS): 10-148-2