First tower supplies gears and iron for mk 1 belts and electromagnetic turbines for mk 2 belts. The mk 1 belts are fed directly to the assemblers for the mk 2 belts. The other tower supplies super-magnetic rings and grapheen for the mk 3 belts. The mk 2 belts are fed directly to the assmeblers for the mk3 belts. The mk 3 belts go to the second tower for distribution.