Final update: Duct tape fixed the "hard point" issue. New window went right in no problem. Gotta keep my thumbs off when stuck. Wing windows are missing a washer between the window channel and the strap that is under it. Owner did not want to remove them so I left them be. That is where one of the washers that have the oval hole in them goes. That supports the wing against the tension applied to the spring and keeps them from tipping in the frame. Sorry I was so late on this last update to be truthful, it just slid off my brain. Getting old is not for the faint of heart.:)

Steve H