[Leica] Help! Leica IIIf Black Dial Problem

[P2CON@aol.com]

Hi all, 
Here is a problem for you screw-mount people out there. I picked up a IIIf BD 
from eBay (I know -- that's my problem!!!).  I have 7 days to evaluate it so 
immediately put a roll through it in my back yard. First problem, the 
rangefinder is essentially unusable due to internal crud, or mirror 
de-silvering. I can make it almost usable by placing an orange filter in 
front of the rangefinder viewing lens, but it is still pretty dim.
Second problem is a light leak into the take-up film chamber through two 
holes in the top deck under the film counter. The light spills onto the film 
as it is being wound on after a shot. It looks like the two holes are screw 
holes with no screws in them. I am suspecting there is a missing mechanism 
there having to do with the film counter, as the counter can only be reset to 
the start position by rotating the wind knob through a complete set of 
numbers to align the arrow with a proper starting position.
Any input from a knowledgeable screw mount user will be much appreciated. I 
know I can fix the light leaks just by plugging the holes, and I can live 
with the tedious resetting of the film counter. Is it a major problem to get 
the rangefinder cleaned up or otherwise made usable?

TIA, and regards, Paul Connet