I created the container for the logic probe when our electronics club was building the logic probe with the CD4001 IC and I did not want to use a pipe for a container.
Circuit comes from https://www.allaboutcircuits.com/projects/diy-tools-build-your-own-logic-probe/
I wanted it to be easy to make at home so used Vero board for the circuit board.
Vero board layout was done in "Do It Yourself Layout Creator".
I added a white led with a switch in the front of probe to use as a light if circuit board area too dark.
Cut the LED's legs so that the LED's protrude about 3mm above the IC but check that the overall height still smaller than container inside. When board placed inside container and LED's pressed into holes, wedge something below board to keep it in place.