Parasol holder for a balcony made of 30x42mm steel pipe

Problem: Mount parasol on balcony. Done. OpenSCAD file has 2 parameters: Height of holder (I use 8 mm) and diameter (not radius!) of the pipe of the parasol. The STL file is for a 24mm hole which perfectly fits the 22 mm pipe of my Lotsudden IKEA parasol. Enjoy.