There’s not a lock, but you can adjust the tension on the thumb slide and thus cause the slide to require more force to open. There’s a video on how to do that here: https://www.youtube.com/watch?v=aQ-atBnbQ7k

I don’t think it will open on its own in your pocket, but if you left-pocket carry, I can certainly see it opening accidentally when you’re putting something _into _ your pocket.

The Victorinox tweezers are… very low quality compared to other offerings. I’ve been using an ALOX Farmer X for a couple years now and I never miss the toothpick or the tweezers. YMMV of course.

I’d use a spray lacquer but only after the paint has been drying for 48 hours. You should do very very light coats many times. Too much and you’ll probably ruin the paint job. The lacquer layering will also take a while as you have to let it dry before applying more.

I’m glad to see a company doing this. I plan to pick up the Flex Modular (with the pliers) this fall.

The other cool thing about this system is that you can, in theory, build a small multi-tool that is TSA friendly. YMMV of course based on how the TSA agents feel that day.