When a Speedmaster case back is fully screwed down…

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…does the inside of the case back actually contact the movement dust cover, thus compressing it, via that little “nipple” in the center?

 
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…does the inside of the case back actually contact the movement dust cover, thus compressing it, via that little “nipple” in the center?

Yes.
 
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That is what keeps the movement from moving around, so if it’s not touching, you will see it...
 
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…does the inside of the case back actually contact the movement dust cover, thus compressing it, via that little “nipple” in the center?

Sometimes I wonder what goes on in Bob’s workshop! You’re fearless Bob!