Bob Bracy, creator of the Raider, the Manta and the Roamer snowmobiles, also made the first push-thru stud in 1975. He took a cold-headed elevator bolt and machined a groove to accept the brazed in carbide. It had an 80 degree carbide wedge and a 5/16" threaded shaft. It had a shoulder and an Allen wrench head.

Bob passed away during the 2004 season.  SNOWsports Dealer News Hot Tip - Push Thru -September 1975 Carbide Wedge History 7mm or 5/16" Stud Head Contours Woody's secret stud shoulder Irrelevant Patent Points Still Irrelevant Everything old is new again (Push-thru studs)

This shows that Fast Trac has been the leader, in providing studs that meet the demands of aggressive trail riders