[Dave A]

A minor update.

I had a stuck lens and worked it out tonight. I think the paper-on-paper tube glide had fused a bit from age. It was just not moving so I just patiently sat there and rocked it and rocked the assembly right off the body. That actually helped as then I could stress just the lens assembly. Remounting later is good.

It only has 7/8" of travel from far focus (lens in) to near focus (lens out). About a 2-4' viewing distance overall per the build instructions. The trick is to focus on the disc holes, not the PE.
Probably not good for exciting views of my back yard.

Eventually I got it to slide straight but still not able to turn. I then candle waxed each open end and kept exercising and adding more candle rubbings. A bit of cardboard powder exited. "Slowly we turn, inch by inch". Success and now it turns freely.

The lens is curently loose so that is a re-glue and then the whole assembly remounts to the cabinet. Bit by bit. Thanks to Jerome/ETF for the complete .pdf assembly instructions. And in the .pdf is the schematic for the camera amp on page 25. Jump in with what you think it is. The receiver .pdf is yet to be found.