Check the listing for details. 1973 Williams Travel Time Pinball Machine Rubber Ring Kit. Condition: New. Listed at 27.45 USD. PCX Pinball LLC. Brown Rebound Rubber. Williams Model 393 released January 1973. Replace those worn, cracked and brittle rubber rings with our premium Rubber Rings. The photo shown is the actual Rubber Rings you will receive, included in this kit are.