The Stimpson 489 Eyelet Machine was produced in two basic head configurations – a regular frame and an “S” frame. The difference is the type of bottom arm that the machine was equipped with. The 489 Regular has a bottom arm of cast iron similar to the rest of the head and base. The 489 “S” version has a round steel arm. The tooling or dies for these machines are not interchangeable. The bottom die is a different diameter and the top die and spindle are different lengths. When ordering tooling for your 489, it is important to know what basic configuration your machine is. This same configuration also applies to Stimpson 469 Deep Throat Eyelet Machines. To the right, is a diagram of the two types of heads.