Pry off the stops that hold the lower sash in place. Remove the old rope from the sash. Then lower the upper sash and pull out the parting strip. Also, remove the upper sash if its rope is broken. Unscrew the sash weight access panel in the side jamb. Remove the weights and old cords. Cut new cords to the length of the old ones and insert them over the pulleys and into the cavity. Then tie the rope to the weight and knot the other end for the sash. Re-install the access panel, sash, and trim.

Tools and Materials
- utility knife
- flat bar
- screwdriver
- hammer
- sash cord (braided nylon is best)
- finishing nails
- paraffin (to lubricate sash and channels)

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