The Phase Variator from Candy Controls, Niles, Ill. (www.candycontrols.com), is a simple but effective method of adjusting the timing relationships between machines even while they are running. It operates as a 1:1 phase transmission with input and output shafts rotating in the same direction. It is made from cast aluminum with steel input and output shafts. Needle bearings with separate oil seals support the shafts and all internal sprockets. The control knob ratio is 36:1, so one full turn of the knob changes the rotational location of the output shaft by 10 relative to the input shaft.