Taking the top cover off is relatively easy... Winding knob has to come off, rewind too, then the meter-adjusting ring on the backside screws out I think, then a few screws for the meter top cover and the top cover itself, and off it goes... You can clean the RF this way, a bit, but not fully. To reach the insides of the viewfinder glass you need some more disassembly, taking the meter unit off and such. I have written the steps down here in a thread long time ago, in november or december last year, but no photos attached.