In case you're wondering, these are what Novastar is referring to:
They are an excellent way to add sound to a hardware saber. You can even fit the big 36mm speaker in there! Add a sink strainer for a speaker grille, and you're done!
Another trick I've done is add grip "rings" on the tube using a tubing cutter:
This can also be used to give the illusion of parts that are screwed together:
I have also found that a square 4-AA battery pack fits nice and snug inside a 1.5 inch tube. Almost a little too snug, actually, and I had to add a "pull" wire to the pack so I could easily get it out.
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