Had to do a couple of tries to get all 6 pieces right. I laser cut a ring of MDF so it would not vacuum form past the top of the part of the jar./ Edit
I actually broke one of the three jars that I vacuum formed my plates from and ended up having to buy totally different jars. Unfortunately it does not fit as well as I would have like especially since the interaction between the light and the jar itself was very crucial to the way the light works. I compromised by having some clear acrylic stuck on the bottom of the jars to ensure that it pushes onto the switch well.