Olympus 35RC rangefinder adjustment

Hello All,

My 35RC rangefinder is mis-aligned at infinity. Not a problem when focusing all the way out but a big problem at close focus as the rangefinder is fooling me into focusing closer than the lens allows. My negatives show this is happening.

I know the horizontal adjustment is behind a small screw above the film transport rail. Can anyone tell me what size screwdriver do I need for the deeper alignment screw? I'd like to have the tools ready when I attempt this.

Thanks!

The driver you're going to need is likely to be between 3 and 5mm.
Someone may chip in with actual size. Of course when you remove the access screw, all will be clear.