I made a few tumblers based on an aquariacentral post I saw, but the problem I am having is the tubes are not creating enough "upward draw" or flow to make the eggs move, I am going to experiment with a longer top tube (i was putting the airstone as deep as it would go) but I think my top portion tube might be too short, if that doesn't fix it I am considering restricting the flow at the top elbow by blocking 50% or so of the out tube hoping that might create more flow.
With a big whisper filter going full blast I can't even get these to move my eggs (or peas as a test), but I hope to fix this soon as I sure could use them

I did buy one egg tumbler from wet thumb a few years ago I can't recall the maker but it's the biggest piece of garbage out there, the parts don't stay together, it's too small and I just fight with it constantly, that is why I was trying the DIY tumbler here.