Silver stationary 1-1/16 inch diameter 'Newton' ball with threaded rod used in Bally/Williams machines.
Used in these and many other late model games:
Bally THEATRE OF MAGIC
Williams NO GOOD GOFERS
Williams TALES OF THE ARABIAN NIGHTS
Williams STAR WARS EPISODE ONE
Reference:
Williams: 04-10005
Jersey Jack Pinball (JJP): 00-000002-00