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| Check whether the entire circumference of the cover seal -2- and body is pretensioned uniformly. For this purpose use cardboard strip of approx. 0.3 mm (e.g. a business card). The cardboard should not slide easily between the two. |
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| If the pre-tensioning of the cover seal is inadequate, prise them apart using a lever -U 30800- and press together with a greater pre-tension. Remove glass cover to adjust cover seal. |
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