What is it #7

Guesses in the comment section.

 

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5 Responses to What is it #7

  1. Roger Thode says:

    Adjustable pitch propeller hub?

  2. No, but you are headed in the right direction

  3. Geeze David. I give someone just a sniff of a hint, you grab it and run.

    Well done.

    No more hints. I should have known better.

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