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Another method I used long time ago...
The 240V globes have glass tube on which the holders for light emitting wire are mounted.
I heated this glass tube in the middle on alcohol flame, and when it became soft enough I pulled two ends apart, quickly.
After some practice (and many broken bulbs) I managed to make two glass fibres, thin enough to be used in eyepiece.
However, optical fibre is much better..
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