Old British instruments often suffer from "frozen" joints due to oxidized whale-oil-based lubricants or old synthetic greases that have turned into varnish.

Hilger & Watts - Publication Reprints | VintageMachinery.org

| Model | Accuracy | Manual Repack Priority | | :--- | :--- | :--- | | | 1 arc-second | Focus on optical micrometer zero adjustment. | | Microptic No. 3 | 20 arc-seconds | Simple; repack needs only basic leveling and circle reading. | | 0.1″ Geodetic | 0.1 arc-second | Critical: The repack must include the reduction tacheometry tables and illumination system for the circles. | | Watson MH (pre-merger) | 1 minute | Requires adaptation notes because it uses external verniers, not an optical micrometer. |

Old grease in instruments from the 1950s and 60s often hardens into a waxy substance that hinders movement.

: Rectangular with a rounded/domed top, often painted greyish-green with a leather carrying strap.

Repacking a vintage is a meticulous process focused on restoring smooth mechanical movement by removing aged, hardened grease and applying fresh lubricants. 1. Scope & Preparation

: Bring the three leveling foot screws to the center of their travel. This prevents them from being under tension or bottoming out against the case base. Vertical Alignment

For the main vertical and horizontal axes, the process involves removing the telescope from its bearings . Clean the spindle and the sleeve thoroughly.

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Hilger Watts Theodolite Manual Repack Jun 2026

Old British instruments often suffer from "frozen" joints due to oxidized whale-oil-based lubricants or old synthetic greases that have turned into varnish.

Hilger & Watts - Publication Reprints | VintageMachinery.org

| Model | Accuracy | Manual Repack Priority | | :--- | :--- | :--- | | | 1 arc-second | Focus on optical micrometer zero adjustment. | | Microptic No. 3 | 20 arc-seconds | Simple; repack needs only basic leveling and circle reading. | | 0.1″ Geodetic | 0.1 arc-second | Critical: The repack must include the reduction tacheometry tables and illumination system for the circles. | | Watson MH (pre-merger) | 1 minute | Requires adaptation notes because it uses external verniers, not an optical micrometer. | hilger watts theodolite manual repack

Old grease in instruments from the 1950s and 60s often hardens into a waxy substance that hinders movement.

: Rectangular with a rounded/domed top, often painted greyish-green with a leather carrying strap. Old British instruments often suffer from "frozen" joints

Repacking a vintage is a meticulous process focused on restoring smooth mechanical movement by removing aged, hardened grease and applying fresh lubricants. 1. Scope & Preparation

: Bring the three leveling foot screws to the center of their travel. This prevents them from being under tension or bottoming out against the case base. Vertical Alignment 3 | 20 arc-seconds | Simple; repack needs

For the main vertical and horizontal axes, the process involves removing the telescope from its bearings . Clean the spindle and the sleeve thoroughly.