Knurl, or knurled knob (both k's are silent), also known as "fine focus" or "spot focus knob" found on Strong Trouper and Super Trouper, and many other manufacturers', followspot s. Use this adjustment to achieve the desired sharp or soft edge focus.
View attachment 5438
Old timers may use the phrase, "Work your knurl" which means "adjust your edge" by turning the knob one direction or the other. Akin to "running the barrel" on an ERS.
View attachment 5438
Old timers may use the phrase, "Work your knurl" which means "adjust your edge" by turning the knob one direction or the other. Akin to "running the barrel" on an ERS.