Timer Battery Cover with lip

Due to the plastic breaking in this $5 timer the battery would no longer stay seated next to the battery contacts, so I was challenged to build this replacement part that could hold the battery in place.
So first I built the plug and then added on a small extrusion to hold the one side of the battery that was slipping out.
I included pictures of the timer, you can just see where one side of the circle that is supposed to hold the battery has broken away.