 Now, I think it's time to work on the safety switch. So these K40 lasers are apparently quite unsafe by design. And you have to help finish them off and make them a little more safe. So if the laser is going and you lift this top up, it'll still keep going. And especially if you have little kids or somebody might be coming through, or you just forget yourself, open it up, get a straight laser beam in the eye, it's no good. So, I ordered some of these micro switches, clicky click. What I'm going to do is wire them into the laser switch, which is that left button there. So that would be the laser on, not laser on, laser off. So the switch will be in the circuit. It will complete the circuit. When the lid is closed, it will break the circuit when the lid is open. So the way that you need to do it is desolder one of the leads to the laser switch, which is that guy, so if we lift this back up. I've already done that, so I desoldered that. Then you've got to go down through this little cable here and start fishing the wire out. Here it is, I'm not done yet, but I'm going to get it out to about here where these other wires are out. And then I'm going to snake it around here, through the back, right there. And then mount my switch here. Now you can drill into the case if you want, but I've seen other people and I don't know if it would fit, so I just took measurements myself and I made a little holder. So that guy will sit on there and then my switch will rest on there and I'll just hot glue it to there and maybe hot glue this to the case. And then when the lid closes, that'll hit the switch and be in business. I may also need to make a little block up here so that the switch will get contacted when the lid closes. But other than that, I think this is good and I'll go and see how it works. Now I've got the switch wired up to my micro switch that will control the door, so go down. I fished it back down through there, it's kind of like sewing, which is interesting. And then let's go back down there and there's our switch mounted up. It's pretty firmly snugly attached. Superbly did the trick. It's clicking and I did have to make a little part that will strike the switch because the lid is too thin to touch right where it needs to. But if you come down and I don't know if you can hear that, I'll get a little closer. So now that'll work. So now my safety switch is installed so the laser will not be able to fire if the lid's open. And I'm sure I can always just press that if I want to live life dangerously. But the default is safe, so that's good.