This is a photo of a double hung window jamb & i need to ask about
The parts that are inside the jamb. Sent 3 photos of same. Please zoom.
The one on top is like a screw that sticks out by 1/2 ". The one right below it is some tension plastic screwed in. These prevent my bottom sash from opening all the way to the top which i need to do in order to fit in my 5000 btu ac unit.
Kindly advise what is their purpose & if i can remove them & if so , how do i do it.
Thank you .
romy