I had a go today but failed , any ideas? A violinist, I know, asked about
such an inspection viewer, small and flexible.
My attempt started with a clump of plastic optical fibres from one of those
lamps with a rotating colour wheel and epoxyied into a lump on the lamp end.
And a dome cut from the top of a clear lens LED. Both ground down , finer
grit, until toothpaste on paper. LED , as a fish-eye lens, sort of focused
the sun at about 5mm so focal length 5mm. Tried fixing lens 5mm and then
10mm from the ground fibres surface and blanked off remaining area.
The other free ends of the fibres grouped as they came so not fully 1:1
mapping but no change of image viewing when moving over a black and white
grid. Any ideas , or a total waste of time. The fibres are coarse 10 thou
diameter , but just giving it a go.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/