Need replace knob that hold the screen in

Question

This picture is sideways. Sorry! Need to replace the missing knob thingy on the left window like the one by the right window. The knob holds the screen in place. No information on the brand of windows is available.

Tom · Accepted Answer

Looks like you need a screen clip like our 70-209. This can be installed using your old thumb screw, but our 70-112 can also work.