You can wire it as in my first picture
to make the kill switch work.
This timer the wires were run through a hole in the
bottom of the timer case and a brass plug was used
to fill the hole. You could still wire it through the
front if you want.
I think that you could get this plug from an Elto dealer.
I’ve seen several done like this. Maybe it came with the
insulator too. Guessing here.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.