The screw that connects the handle to the head broke, and I had to come up with a replacement. I checked the size and modeled it in Fusion 360.
All of the original files are available for download.
The tolerance in the model is 0.2 mm.
Print with PETG, PLA breaks.
Use 100% infill.
It's been two months now. So far, it works fine.
The author marked this model as their own original creation.