Added a magnet so we can use our ducts as a drying line
Friction fit 5mm diameter magnets. I stacked 3 to increase the hold. Hole is made for taking 3 2mm tall magnets
Hole - 5mm by 6mm
Maybe add some super glue, but mine work just as friction fit without issue
These are the magnets I am using; https://www.amazon.com/gp/product/B09F8S7755/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author remixed this model.