Need to make rubber part for top...

I'm recreating this part for practice, and I'm stuck on making the rubber gasket for the top. I need to make the part using the curvature of the inside top. Essentially, the inside top curvature would boolean subtract from the part I need to still make. How would you do this?

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I would draw it in place on the cap but make sure you uncheck the "merge" bodies on your first extrude (or loft, sweep, etc.) so you get a multi-body part. After that you can use combine commands such as Subtract. If I get some time Ill make a tutorial.

 
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