I have a house built in 1839 in CT and want to do simple restoration on the windows. I just want to leave the frame in and install a product that makes the sashes more weatherproof. I have investigated several approaches, but want to get any input from others who have done a similar job. One product I saw requires me to plane 3/8 inch off each side of the sash to install a new track in the window frame. I'm not sure I want to take that much off my sahses. Anyway - thanks for any advice you can give.