Google is great for many things including ideas to fix problems you hadn’t thought of before. The challenge is usually looking for suggested parts required for the fix which often means (when you know your local hardware stores do not have them) looking online and patiently waiting for them to arrive. I was bothered by the constantly swaying and needed to do something — then I remembered I bought some strong magnets from Daiso and as it turned out, these magnets made the job so much easier. Although the magnets were intended to be a temporary fix, I think they are staying on much longer, and I’m lucky I have fans with metal blades.
Caution: Make sure you use strong magnets or risk injury or damage if one dislodges when fan is running at higher speed. Typically for me, I run mine at speed setting no. 2 which is more than enough cooling.