window will not go up. counter balance that hild window at bttom are stuck at bottom of track.

We notice our 15-135 pivot shoe looks like the one you are looking to replace. These shoes go with our Series 770 channel balance system. Your shoe is stuck because the center metal cam is in the "up" position. We would like for you to check the pivot bars in the sash to see if any of them are broken. You can place a screw driver in the center and turn it towards you to release the shoe to see if it still works. Hold on to the shoe because the spring will pull it up. We hope this information has been helpful to you