How do I have rotating parts in a welded accessory?

Alright so I have an accessory and since its an accessory it needs to be welded and unanchored, of course. I intended to have a part inside the model rotate(a spinning cylinder in this case) but my inept knowledge of constraints is preventing me from achieving this lol.

When everything’s welded it just rotates the entire model which, of course, is not optimal.

Any help on what constraints to use and how to do it is appreciated!

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