For my 24 GHz dish I needed a feedhorn. The VE4MA superfeed proved to be almost perfect for the job. I made 2 of them using copper tube with a wall thickness of 1.5mm. It was very difficult to fit in the flange. Copper tubing with a wall thickness of 1mm is much easier and gives a lower SWR.
For those interested there are 2 horns available from the production of 5, contact me if you are interested. See the for sale page HERE.
The measurements are done by Jack PE1KXH. See the following pictures:
The dimension and ideas come from the excellent website of Paul W1GHZ. Thank you Paul. You can download the dimensions. Drawing made by Bas our son in law.