Flexible stops on plastic cylindrical body

Hello everyone,

I would like to create on a plastic cylinder 4 flexible stops to insert a washer without it being able to escape afterwards. I stumble over how to make these (lamellae) on the body of the cylinder. Do any of you have an idea, a particular function?

I put my piece in PC, so that you can see what I'm looking for, I think that my method is not the right one.

Thank you in advance
CLIPS. SLDPRT (116.3 KB)