: Apply fresh grease sparingly. A common mistake is over-lubricating, which can attract dust or migrate onto the optics. Smoothness Check
Submerge the solid mechanical parts (spindle, bush, leveling screws, and tangent assemblies) in a bath of mineral spirits. hilger watts theodolite manual repack
Hilger & Watts instruments have intricate internal linkages. Take photos at every stage of disassembly to ensure you know the orientation of gears and optical paths. 2. Degreasing (The "Clean") : Apply fresh grease sparingly