We recently bought a house built in 1958. The windows are double-hung wooden windows with aluminum liners on the sides of the jambs. On the left side of bottom (inside) sash there is an aluminum tube (maybe 5/8" in dia) that runs from the top of the jamb down to the window, but not all the way through the window. Some of the windows are stuck, others open fine and stay open, and others open but slide back down. My question really is how do these windows work? Is it just friction between the metal liners and the window sash that should hold the windows open? What can I do for the windows that do not stay open? and lastly what is the purpose of the aluminum tube? Thanks for any help.