When Corkscrew first opened at Knott's Berry Farm, it achieved two things of historical significance. Corkscrew was not only the first modern inverting coaster in the world, but it also was the first roller coaster to take riders upside down twice. Corkscrew was actually a prototype originally built on site at Arrow Dynamics in Mountain View in Santa Clara County, California (before Arrow Dynamics' relocation to Utah). Once Arrow Dynamics completed reviewing the design, members of the Knott's family personally opted to purchase the prototype. Ten exact replicas were produced 1975–1979. In 1989 Knott's Berry Farm sold the Corkscrew to Silverwood Theme Park in Idaho for $250,000 to make room for Boomerang.
^Murray, Kathy (12 September 1989). Metro. "Knott's Berry Farm pulling Corkscrew from its ride lineup // Prototype coaster is sold to Idaho amusement park". The Orange County Register (Evening ed.). p. B03.
^ abcdeDubin, Zan (17 September 1989) "Venerable Corkscrew: End of a Long Ride : Before Knott's Historic Roller Coaster Is Carted Off to Idaho Park, Many Pause to Attest to Its Thrills". The Los Angeles Times