Have to say that looks a lot like one I made and plum forgot about it until I saw this thread. Sorry no pics atm.
I’ve been having to wait 2 months plus to root cuttings for a Zamaldelica grow I’ve been focusing on.
Zam is one tough lady.
Just stuck a branch from a sample harvest into an outdoor pot 2 weeks ago and she’s still green.
Seeing these incredible results has reinvigorated my effort to clone her under a month using mine.
I think though, that I will replace the cover which is made for neoprene plugs.
Smaller like the one here dyi by @Eagles009 
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