[Vlad95]

The mica insulator serves only to prevent short circuits at maximum capacity. And to increase the maximum capacity due to the increased dielectric constant of the gasket. The plastic washer insulator isolates the hole in the elastic movable trimmer lining from the threaded axis due to the protruding rim, which can simply wear out. To prevent short circuits, it is necessary to precisely center the hole in the movable lining relative to the adjusting rod during assembly and install the plastic washer so that its rim fits completely into the hole in the plate.