How to Clean a Gehmann Aperture

Written by andrew youngker
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How to Clean a Gehmann Aperture
Soft brushes may be used to remove dirt from the aperture. (a row of used paint brushes image by Gleb Semenjuk from

Gehmann gun apertures can be taken apart for occasional cleaning. Dust on the body of the aperture can be removed with a clean cloth. Deep cleaning can remove dust trapped in the iris of the aperture. Avoid using oil and medical solvents to clean as these may harm the equipment. Gehmann recommends air pressure or a soft brush for cleaning.

Skill level:

Things you need

  • Locking wrench
  • Tweezers
  • Compressed air
  • Soft brush
  • Optical cloth

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  1. 1

    Remove the optic using the locking wrench in a counterclockwise manner.

  2. 2

    Unscrew the cover plate using the locking wrench while holding on to the colour adjustment ring.

  3. 3

    Align the colour adjustment ring with the two light marks and remove the index ring. The colour filter can be removed using a pair of tweezers.

  4. 4

    Clean all parts using a soft brush or compressed air to remove dust. An optical cloth may be used to clean the filters if needed.

  1. 1

    Place sight body, viewing end downward, on a flat surface.

  2. 2

    Place the colour filter in which the gap aligns with the cut-out of the filter chamber. When the yellow filter is positioned directly to the right of the gap, the filter is correctly in place.

  3. 3

    Replace the index ring and align the retaining stud with the large cut-out.

  4. 4

    Turn the colour adjustment ring to align the white marks.Turn the ring counterclockwise until it stops.

  5. 5

    Screw on the cover plate with a clockwise motion using the locking wrench.

  6. 6

    Secure assembly on the remaining part of the optic using a clockwise motion with the locking wrench.

Tips and warnings

  • Avoid using cleaning solvents to clean the aperture.

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