What screwdriver do I need to disassemble RB67 focusing screen?

MCB18

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Joined
Jan 16, 2023
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978
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Colorado
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My smallest slotted screwdriver will not fit in the space. I don’t know exactly what I need to unscrew the brackets so that I can switch the fresnel lenses of 2 lenses. @Mamiya_Repair seems like something you might know, but anyone is welcome to help out.
 
OP
OP

MCB18

Subscriber
Joined
Jan 16, 2023
Messages
978
Location
Colorado
Format
Medium Format
Ok, I did manage to open it and exchange the lenses using a glasses screwdriver. And man, those screws are tiny!

One more question, there seems to be a smudge on the matte side of the focusing screen, and I would like to clean it, but I don’t want to damage the screen (which I’m imagining would be rather easy to if you aren’t careful. Any advice?
 

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