Two knurled aluminum knobs for the hero panel, of two different heights and same diameter. They'll attach to the electronics set you've got, replacing the knobs that come with it to make it more accurate. These match the accepted dimensions of the found parts from the Michell turntable, a known source of many parts in Star Wars. Ships with two set screws to keep them in place.
**This is included in the Core panel set. You don't need to order it if you're getting a master greeblie pack or core panel set.