Window balance

I have a window where the balance has came uncoiled. I cannot open or tilt in the window right now because of it. I am also hesitant to remove everything because it is winter, I don't want to have the window out.
Can you help me identify a common weight for a household window? I am kind of stuck with removing the balance right now and it is uncoiled and jammed. The photo of the double weight is from the second identical window in the room.