JUPITER - Jupiter 3 Clean and Lube 39mm CLA

Comprehensive clean and lubrication (CLA) guide for the Jupiter-3 lens This manual provides detailed instructions for maintaining the 39mm focus mount of this classic lens design. The document outlines the five main mechanism components—the 39mm mount, inner helical, outer helical with inner sleeve, and focus ring—and lists all necessary tools including precision screwdrivers, compartmented trays, solvents, and lubricating grease. Step-by-step procedures cover safe removal of the optical module, disassembly of the focus ring, and thorough cleaning of both inner and outer helical sections. The guide emphasizes critical maintenance practices such as preserving original component positions, creating scribe marks, and carefully managing guide pins that control focus travel. Special attention is given to cleaning the outer helical assembly while keeping the sleeve partially unscrewed to avoid misalignment, removing dried grease deposits using solvent and brushes, and applying fresh lubricant judiciously. The reassembly section details proper alignment techniques using tap positioning and guide pin marks to ensure correct rangefinder coupling and optimal focus performance. Optional procedures for securing set screws with lacquer are also discussed.