I have a weird shaped door knob that none of the CP covers fit so I had to modify Fritdiverdowns mod, so this is a mod of a mod. ;-)
Looking at lowes.com to see what these 1960s door knobs are, there are a few names for the same thing but the most common name was "Georgian" so going with that.
They work well, I can get through the door but my daughter had a melt down when she couldn't.... love them terrible twos.
What I ended up doing:
Scaled it down to fit my knob height and width.
Re-cut the hole for the handle since it shrunk too (the original hole size was perfect)
Raised the cutouts higher to make it easier for an adult with a big hand to reach thumb and finger in to open the door.
Child_Saftey_Door_Knob_Cover.stl | 172.4KB |