Screen thumbscrew
Looks like you need a new plunger pin, though this design is unfamiliar to me. Might there be more to it? A cap of some sort, perhaps? Or is this all there is? Seeing a full and undamaged version would be helpful, if that's possible.
Thanks! Please give us a little more time to investigate this and I'll get back to you ASAP.
Unfortunately, our search has yielded no results. We don't carry your exact screen pin and I haven't been able to find anyone who does. The only company that may have an exact match is possibly the window manufacturer.
We do carry a type of spring loaded pin that may work if you're handy and willing to make adaptations. Take a look at our 70-008 and 70-009. See if either of these sizes is something you can adapt to your screen.