So I was a little embarrassed when this happened, but now all has worked out, so I can tell the story.
I received an Olympus Pen EES-2 from Diane Peterson in the Share the Love 3 exchange. I put one roll through it (72 exposures!!) and noticed that everything seemed pretty underexposed. So I did a little research and learned that it is common for the aperture blades to stick closed in this model as it ages. It seemed like a pretty easy fix, so I went ahead and disassembled the camera and got the aperture blades working again, but when I got to the very last step, I couldn't get the front lens element to catch the threads and screw back on! This was terrible! The camera was functioning perfectly otherwise, but without the front element, it may as well be a 'parts' camera. Fast forward to the present. I am
refurbing an Agfa Isolette III and lo and behold the exact same thing happens!! Well, I can't put this camera on the shelf, I haven't even taken a single photo with it! So I start asking around and I get an answer from Jurgen over at Certo6.com. He seems to be a really nice guy and was very responsive to my questions. It turns out the Isolette just needed a really good cleaning of the threads with some solvent and a bit of lithium grease. So I decided to try the same thing on the Pen. No luck. Jurgen had also said that he had taken the glass bits out and deburred the threads with a brass brush on a rotary tool. So that was next. I have to say that a whole bunch more gunk came out of those threads once I hit them with that brush. More solvent, more grease and a little more effort and I finally got the front element back on!! I am so happy to have my half-frame RF back in service! I have a roll of FP4 Plus in it now and will post some pics when I get through it. I must say, it does take a long time for me to shoot 48 half frames, so maybe in a month or two.
Thanks again to Diane for this cool little camera. I am really enjoying it.