Clearly not much to do at work then!
Hose pipe for the tube?....just might be the right size and won't allow light to escape.
Anyway, looks good...just trim the top plate so its round and it will look much neater. You could also use momething like a plastic bottle top to replace the tube and backing plate. Cut the hole and notches in the top and you've saved time in the process making.
Good call on the bottle cap! I like it. Might be a bit wide, but worth a shot. Or something like it anyway.
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