Experience with clearing Mamiya 645 magnifier eyepiece optics?

[Ulophot]

I bought mine used years ago and it works fairly well, but today I had it in a scene with some bright background. The image through the lens was not showing significant flare, but the magnifier sure was, making it a challenge to use. The outer optical surfaces are in fairly decent shape, so I suspect that the inner ones may have clouded up over time and I wonder if I can clean them myself.
There are four small screws that hold on the metal "collar" that slips over the camera eyepiece. I'm guessing that removing the crews may also open the device's optics compartment, but I don't want to take something apart that I won't know how to put back together properly -- I'm not skilled at such things.
Anyone have experience with this little item?
Thanks.

 

[Ulophot]

Well, I unscrewed the four screws. Three tiny set screws hold the piece I needed to remove, so I loosened those as well. I gained access to one surface that needed cleaning and another that was pristine. After cleaning the one surface and reassembling, and cleaning the camera eye piece as well, things are at least much improved.