This was a quick OpenSCAD creation to easily create attach points for the top of a PVC pipe. The current model is based on a 32mm (O.D.) PVC pipe, and friction fits from my printer quite well. You may want to add some glue to ensure a longer lasting fit.

This was designed to be a top of a amateur radio mast (hold a loop antenna and/or guy wires), but you can use zip ties to attach just about anything.

I am NOT a structural nor materials engineer. Use this at your own risk.

It is customizable, so you should be able to resize the model for difference sizes of PVC pipe, or to change the sizes and thickness of the shell & loops.