Does the door open in or out?
this might work.
http://www.calslock.com/calslock.html
Or instead of replacing the knob set add a dead bolt. This is a separate unit that has no dependence on the handle set.
This type surface mounts and only requires a hole for key tumbler.
this might work.
http://www.calslock.com/calslock.html


Or instead of replacing the knob set add a dead bolt. This is a separate unit that has no dependence on the handle set.
This type surface mounts and only requires a hole for key tumbler.
