28 model a roadster front window sill

[MickyD]

At the bottom of the front window, in the middle of the window sill, is a hole. I believe something goes in it to stop the window from coming in when driving my car. No matter how fast I go, maybe too fast the window comes in. I put a bolt in the hole with some rubber grommets to stop the window from coming in. The hole is the same size as the window wiper hole. Does anyone know what goes in that hole and what it looks like. Now that I know how to post a picture I will try and get one tomorrow.