 Winckler assisted in the design of the Speed Racer die-cast cars, coming up with the concept of attachable parts, buzz saws, auto jacks, etc., to the Mach Five vehicle, and Tom Lowe incorporated Winckler's ideas into the product line.Winckler was paid royalties on Speed Racer and other licensed properties, but then Playing Mantis failed to continue paying owed royalties on Speed Racer to Winckler.Winckler considered suing Playing Mantis in court for money owed a second time, but never pursued it further.