Green Building Q&A: mechanical sash operators for inside sash weight pocket
I'm trying to eliminate the iron sash weights and still get operable windows. Somewhere in my travels I've seen ( at lest I think I have) springs or some sort of lifting mechanism mounted in a tube, that fits inside the sash weight pocket. I've been running into homes that have beautiful operable windows and trim that I don't want mess up with vinyl spring slides that are exposed. I'd like to put the "tubes" in the sash weight pockets and them foam them in to insulate and knock down the air leaks. Can anybody point me to where I can buy these and if anybody as done this I'd like to hear how you did it so I don't have to reinvent this wheel.