How to Repair a Double-Hung Window Lock

Written by steven white
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Home security is essential, especially in areas with high crime rates. Broken or rusty latches should be promptly replaced to ensure further residential safety. Repairing an old double-hung window lock is a simple process. It should take a homeowner no longer than 30 minutes, and the result--a more secure home--is well worth the effort.

Skill level:

Things you need

  • Screwdriver
  • Cake of soft soap
  • Medium flat-blade screwdriver
  • Center-latch sash lock
  • Petroleum jelly
  • Cotton swabs

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  1. 1

    Close the window so that the sashes line up.

  2. 2

    Unscrew the side screws, using a screwdriver, to remove the old window latch lock.

  3. 3

    Attach the center, latching part of the new lock. Run the screws over a cake of soap before installing them for a clean, friction-free installation.

  4. 4

    Place the hook section of the latch in the center of the latch piece. Soap the screws and install the hook, using the screwdriver.

  5. 5

    Place a thin layer of petroleum jelly over the hook's gears with a cotton swab to lubricate the latch.

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