This is mostly inspired of very nice project I found on Thingiverse by d23elt05a
I liked it but it didn't fit my rod.
PETG / ABS recommended
PLA is not recommended to be used with water for a long time (but for short time it will be ok)
2x M5 Nuts
2x M5 X 40mm Screws
Created in SketchUp - files included. Feel free to remix this remix, if you need different rod diameter ;)