Since I have my own 3/4" MDF and make 4" rings for the same project, I can see a big difference in the quality of the determine the MDF used. They feel brittle and even started breaking when I screwed them to my car door. In comparison, the MDF I used was very strong and sturdy. You could probably break that ring on your leg. I wouldn't try the ones I made. This will get the job done. When installing, just be aware of its weakness.
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