ca victoria , the green bible , on page 292 , shows all the clusters . i have 74-7113 A and 74-7113 D . the early cluster (74-7113 A ) has the following : 29-19-17-13 the last two are spur gears (straight cut teeth) the later cluster (74-7113 D ) has the following : 29-19-17-13 all the teeth on this gear are helical cut . carl ( sale pending cash payment reciept )