Pivot stays down and window won

Hello there. It appears you have a Series 140 Quic-Tilt coil spring system that may be stuck. Let's see if we can help you remove this. With the bottom shoe center metal cam in the "up" position, almost like the letter "U", it's in the locking position. With a screwdriver, carefully put a slot screwdriver in the cam and turn to the outside, so hang on because it is under pressure. It should come off from there. I hope you find this information helpful.