This is a flat top fine tuner knob with 6-32 (course) threading for Kahler 2500/2520 Traditional fulcrum, 2330 FLYER and 3330/7330 fixed Bridges. It can also be used for any Kahler CAM models if you prefer the look.
There were two types of fine tuners used on the 2500 and 2520 "Traditional" models. Either this flat top 8394 fine tuner with a 6-32 course thread or a dome top 8385 fine tuner with a 6-40 fine thread. Just inspect the fine tuner hole or your remaining tuners to see which one yours came with.
