Step 13Illumination with LED's
One end was closed with hot glue plus a nut of a compression fitting and an orphaned green LED I had gotten in a grab bag. The other end was bored open to 5mm or rather 7/32" to house the LED. (be careful, this material is very brittle )
I filled the empty pen with hair gel. (Idea borrowed from Hair-Gel-LED-Light)
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