3296 – 3/8 ” Square Trimpot Trimming Potentiometers perform a variety of circuit adjustments in all types of electronic equipment. Multi-turn trimmers consist of three actuation types – lead screw, worm gear, and planetary gear. Lead screw actuated trimmers have a linear wiper path; worm gear and planetary gear actuated trimmers have a circular path. Multiturn trimmers are suitable for applications that require fine resistance adjustment.