The Zeus freewheel used all splined cogs except the outermost, which was threaded to hold the rest in place. All the splined cogs were completely interchangeable. No spacers were needed; the cogs themselves were shaped to provide the needed clearance. All the splined cogs were aluminum for light weight; the threaded cog was steel. The body featured two notches to fit a standard Regina 2-prong tool, but was also splined to use Zeus's own remover that eliminated the risk of damage to the body that pronged removers often cause. The splined remover proved so popular that the French freewheel manufacturer Atom/Maillard copied it, and later Italy's Regina also copied it so a single splined tool would fit freewheels from Zeus, Atom/Maillard, and Regina. Shimano eventually came out with their own incompatible splined freewheel tool, but unlike the Zeus tool it required removal of the axle locknut and spacers for the tool to get access to the freewheel body. This was eventually changed to another incompatible splined design with a thin wall remover (like Zeus had all along) so no disassembly was necessary.