zig zag slotZ Zag is a Trade Stim. by Groetchen Tool & Mfg. Co. (circa 1931). Information about it's history and background, photos, repair help, manuals, for sale and wanted lists, and census survey isHere's how the Z Zag System works: Step One: Observe the slot machine reels for a few minutes. Step Two: Look for a z zag pattern in the symbols on the screen. Step Three: