Quote Originally Posted by Jim Jones View Post
... Aside from selenium cell deterioration, the most common problem may be imbalance of the armature. ...
The other common problem is oxidization of the contact strip on the back side of the selenium cell. Some folks have DIY repaired non-working Westons by disassembly, cleaning, and reassembly. Some have even had "accurate-enough" working meters result from this "half-assed expedient".