How to add a cosmetic thread to this part?


Here is the way to do it:
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Step 1:
1. Go to the appearances tab on the right and find the screw thread appearance.
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Step 2:
2. Drag n drop the appearance onto the surface
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Step 3:
3. Edit the appearance and check advanced and go to mapping. Then adjust the width of the texture to get the result you want. Good luck.