Konica IB How does one remove top plate to clean and adjust rangefinder

[Palacios48]

My focus is the film advance release button....Before starting in on this, curious how to deal with that button. Other screws etc. fairly straight forward I presume.

 

[Palacios48]

Since I had a"for parts" body to learn on...the film advance release button affects nothing as you remove top. Just 2 screws under rewind knob, two under film advance knob. Unscrew eyepiece. Clean only the glass lenses. Do NOT touch the diagonal glass with rangefinder film on it or you will be using a zone focus camera...no longer a "rangefinder" going forward. Adjust rangefinder if you are adventurous, but hopefully not.