Screw tip jiggles top off doohickeys (7)

I believe the answer is:

widgets

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'doohickeys' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for widgets that I've seen before include "Small gadgets or components" , "Any gadgets, devices" .)

I've seen this clue in the Sydney Morning Herald.

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