Thanks for that information, yours is a beauty as well!
Update time
I fabricated, adapted, cut, filed and assembled the rear light on top of the fender.
I shortly tried it on the chainstay but immediately decided to go for the fender. It fits the front light and it gives the bike that "art deco / jet age" look.... just slightly.
It is small enough to not draw all the attention away.
The process;
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Parts drawing. Adapter on top.
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Adapter for the light base and the red glass.
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Testfit. Its countersunk on the other end so it centers!
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Can't go back now!
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Alrighty
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Painted the adapter dark grey and assembled a threaded rod. About to cut!
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Glued the red glass on. Pressed it on gently.
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Assembled with an acorn nut.
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Its getting dark. Thunderstorm is a comin'!
After lots of measuring, checking I disassembled the rear wheel and drilled two holes. The screw assembled in the picture is for alignment, it fits the lamp corner radius on the inside.
I decided to use some sort of round (teeth?) nut and drill a hole sideways through the light base.
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Assembled with thick sticky grease!
Very happy how this turned out! There is space for diode lights and cables if I want it to work, but first I'll try to finish this bike for the buildoff!