[The Philpott]

....and check that the glass is (clean, and) firmly glued in place once the movement is out of the meter. In order to settle meter readings there is a tendency for users to tap the glass rather than rock the entire meter on it's tripod feet....and over time this can loosen the glass.

As the movement is the most sensitive part of the meter, once it is out there is also an opportunity to blow, tap and shake loose debris- shellac flakes, solder balls, etc out of the meter without causing damage. On one occasion this liberated an extraneous screw left in there during previous maintenance!

Dave