Nintendo Game & Watch Battery Cover

I lost the battery lid for one of my childhood Game & Watch games a long time ago. I used the lid of one of my other games to model a printable replacement. It's a very snug fit, which I prefer since these things are not supposed to come out until you want them to. I tried it with all my Game & Watch units (3 of them) and didn't experience any problems. I also tried it with batteries and the games worked fine.