Quote Originally Posted by E. von Hoegh View Post
Quite a lot of selenium meters can be made useful again simply by removing the cell and cleaning the spring contacts, then going over the contact points on the cell with a bit of rough cloth. The link mentioned steelwool, use this only if you want it to end up on the magnets within the meter movement - surprising how that stuff gets around. Be very careful not to remove any of the lacquer (? something clear) coating which protects most of the cell from the atmosphere, do this and it will die.
That's actually NOT true. I've worked on more than a dozen of these. Only one had a meter that couldn't be repaired. In all other cases, the meters were brought back to life.

As always, use care when working with your cameras. And compressed air should always be part of your arsenal to blow out any debris - including that created by you and what might already be in your camera.