Our Thumb Latch (TL 01) sash lock is an updated version of the old Babcock Catch originally patented in 1880. These clever locks are used in single hung window applications where no balance system is present. If you have an old home, you’ve experienced the vexing issue of how to hold the lower (operable) sash open. Owners have come up with myriad ways to prop their windows open from sticks to paperbacks (which inevitably end up falling out of the window and into the shrubs, never to be seen again). These locks solve this problem forever! Our TL 01 locks are easily retrofitted into existing windows (requiring the removal of one sash stop and the lower sash), are unobtrusive and permanent. Only the small “push-button” remains visible.
Note: use 3/4″ Forstner or Multispur bit to drill the hole into the jamb. As ever with tight fitting hardware or screws, a bit of Bowling Wax the threads is good practice and will ease installation.