Sifam meter zero adjustment screw not working

[salomonander]

Hey,
I think i might have killed a sifam meter. I gave the zero adjustment screw a full turn and now it seems to be loose. It has no mechanical effect on the needle at this point. It just turns endlessly. Any way to fix this? Or am i screwed? Thanks

 

[gyraf]

you can still adjust the meter zero if you can get off the front glass, and it's an adjustment that you only do once anyway..

 

[salomonander]

Thanks Jakob,
do you by any chance know if the nut that came loose (i can hear it rattling in the meter housing) is made of plastic or metal? Im afraid of causing a short.


And the front glass is glued on - but only at four spots. I guess one could open it by cutting the glue with a razor blade. Is there a chance to get the nut back on the trimmer screw? Or would it only allow me to set zero once and the front trimmer would still not work?

And does anyone know if i caused this by doing two full turns? I want to know if im responsible, or if someone before me turned it too often.

Thanks!