Your question is CAD a Custom Unique Screw. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Here's a custom unique screw that needs to be manufactured, not a custom size or length. How would you cad this part?
Explain how you would gather requirements, create the geometry, define manufacturing-critical tolerances, validate the design, and produce manufacturing documentation. Discuss how you would handle ambiguity, inspectability, and feedback from manufacturing.