I tried multiple child locks, but none worked well. Only one working was magnetic one, but we had problem unlocking. This latch, which needs hole drilled to top counter. Nothing is visible from top. Latch has sliding length of 10mm. It uses spring to make it little bit harder for kid to open. Use double sided adhesive tape.
you can edit it (change dimensions, etc) in onshape:
https://cad.onshape.com/documents/c238fae8d00d9dffdebfac8e/w/fab7b9609e352fc6879230d4/e/4bf247753984eff39e2dc06e
| bolt.stl | 2.1MB | |
| handle.stl | 4.6MB | |
| shell.stl | 4.8MB |
