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jglowluna posted on r/centuryhomes1w
If you open the window, do you have the metal rails/ weather strips on the sides? You might able to add them if there are already grooves in the sashes. I found this book invaluable fixing a window in our century home. The Window Sash Bible: a A Guide... https://www.amazon.com/dp/1505299144?ref=ppx_pop_mob_ap_share