Just put a post on my blog about this simple & easy scratch-build.
The common household item that made the whole thing possible was the cardboard "core" from an empty roll of masking tape:






That's about all you need to know to do it yourself!
...BUT if you'd like to read more about it and see some more pics of the finished model in action, I invite you to come visit my blog at the link below, and thanks in advance for your time if you choose to do so:
https://maiwandday.blogspot.com/2024/08/scratchbuild-simple-easy-28mm-water.html