My bad dreams are just like this.

COLLAR is the subject. My parts are similar but I think you can slide your tumbler through the opening of your collar.

My hardened collar holds my tumbler in. I know the clip(s) are pressed in, but the collar holds the tumbler in.

I know the collar holds in the tumbler, so when I'm told that the clip(s) will release the collar, then something is wrong. How can they each hold each other in?

Anyone?