In my opinion the thicker parts of your saber ruin the lines. Those are the large nut on the threaded section, the grip, and the pommel. If I were you I'd unscrew the emitter "sink drain" and then unthread the large nut. I'd use something else for the grip. Do-Clo posted a nice O-ring/heatshrink combo that would look good with this saber. I'd also find something else for the pommel that is slimmer.
To show you what I mean I have mocked up a similar saber in the spirit of yours. It's the same kind of sink tube with a simple beveled emitter and some random car part I found in the parking lot of a local taqueria as the pommel. I shoved the polycarbonate dome of an LED air valve cover in the hole. This isn'a working saber, just put it together here after reading your post.
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