On the bottom hinge I have a small piece of plastic with a ridge on it,
that slides up and down the hinge. It seems all it does is to make the
window more easier/harder to close when the bottom of window frame meets
the plastic. i.e. The more I slide it away from the window handle the
easier it is for the window to close.

I was wondering what does it do, and what position should it be set to?


TIA