Bubble magus curve 7 elite part missing

[umersaleem0388]

Hi
I was cleaning the skimmer for the first time and I think i misplaced this little rubber insert that goes on the inside of the skimmer body connected to the adjusting disc. I have the screw that slides in the bottom but the disc wont stay because the other side of it probably went down the drain. What is it called and can I order this small rubbber part alone?

 

[lapin]

Maybe here page 21?
https://seasideaquatics.com/parts/replacement-skimmers-parts-c-3.html?page=3&sort=20a

 

[FUNGI]

worst case, DIY.
Nylon Push Pins..HD and Autozone have them. Just need to find the right size.