I am looking for a product that my boyfriend swears he saw on an old episode of home again, or maybe this old house. There is supposed to be a plastic?? system that you can put in to replace the old counterweigt system on old wood windows. Supposed to be more energy efficient and easier to open and close. They are just plastic tracks that get put in the old (jam-sash not sure of term there)and the windows are popped into. Anybody have a clue if such exists and if so were on the internet I can get more info?