This is a remix of the following model https://www.thingiverse.com/thing:3418092/files, which is licenced under the Creative Commons - Attribution license.

I made this 1mm longer than my original bracket to ensure a tight fit against the shower pole, and it supports flat head screws which should provide stronger support than countersunk screws. It also has a small lip at the top to hold the original rubber stopper.

I suggest printing at a high infill for strength. I did not need any supports or a brim, which would have made the thread untidy.