They build four versions of this machine; a short stroke liner, a long stroke liner, a shader, and a coloring machine. All Green Monster Machines are built with 8 wrap Eikon Crown Standard coils and Tru-Spring armature bars and springs.

The Liner machines have a light-weight armature bar and a 15uF capacitor. The air gap on the Short Stroke Liner Machine is 3/64” (dime), resulting in a speed of approximately 140 Hz with a tube and needle set-up in the machine. The Short Stroke Liner Machine has a 0.019” thick timing spring and a 0.018” thick main spring. The air gap on the Long Stroke Liner Machine is 1/16” (nickel) resulting in a speed of approximately 140 Hz with a tube and needle set-up in the machine. The Long Stroke Liner Machine has a 0.020” thick timing spring and a 0.019” thick main spring.

The Shader Machine has a mid-weight armature bar, a 33uF capacitor, and a 0.016” thick timing spring with a 0.017” thick main spring. The air gap on the Shader Machine is 1/16” (nickel), resulting in a speed of approximately 110 Hz with a tube and needle set up in the machine.

The Coloring Machine has a heavy-weight armature bar, a 47uF capacitor, and a 0.015” thick timing spring with a 0.016” thick main spring. The air gap on the Coloring Machine is 1/16” (nickel), resulting in a speed of approximately 100 Hz with a tube and needle set up in the machine.

Conventional Blue Tempered Spring Kit contains two of each timing spring: 0.016”, 0.018”, 0.020”, 0.022”, two of each 1/2” wide back spring: 0.016”, 0.018”, 0.020”, 0.022”, and two of each 5/8” tapered main spring: 0.016”, 0.018”, 0.020”, 0.022”. Total of 24 springs.

IMPORTANT: Tru-Spring armature bars will not fit on some cut-back style machine frames. To determine if a Tru-Spring armature bar will fit on a machine, measure from the contact points to the center of the back spring mounting screw. If this measurement is 1 7/8" (48 mm) or over, a Tru-Spring armature bar and springs will fit on that machine.