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")
: Before packing, use cotton wool or a small brush to remove dust from the surface. If the instrument was exposed to rain, ensure it is completely dry. Clean the exposed optics only with high-absorbent cotton or lens-cleaning paper; never use handkerchiefs or clothes . hilger watts theodolite manual repack
Check for "play" or wobbles. If the instrument feels loose after repacking, you may need to adjust the tensioning screws or "gib" strips often found in the Hilger & Watts ST156-4 and similar models. Hilger & Watts instruments have intricate internal linkages