 Well, hi, this is Alex. Sideshow Mick pointed out in the comments section on my picking video of this Tessa lock that the spacing between pins 3 and 4 is different than the spacing between the other pins, and I didn't quite get what he meant the first time, but then I went and looked at the lock and, sure enough, so I have here the lock. This is the opening of the keyway. This is the back, so it's pin 1 through pin 5, and here's the key in the same orientation, and you can see here that the first three pins have equal spacing, so the spacing between those is 0.180 inches or 0.4, I'm sorry, 4.57mm between these on center. Then you get to 3 and 4, and the spacing goes to 0.210 inches or 5.33mm, which is a difference of 0.030 inches, 30,000ths or 0.76mm between these two, and then the spacing goes back to the previous 180. On the key you can see the same thing, so you see this larger space here between these two pins, or cuts. Now why would they do this? I don't think it's a manufacturing defect, it's too big of a difference to be unintentional. I think what it is, is that it increases the max, or the maximum adjacent cut specification for this spacing here between pins 3 and 4, and it allows them to have this cut way down here, so that's like a cut down to the ward that's probably a maximum depth cut, and up here we have, you know, that's maybe a 1 or 2, I don't know. So if this spacing were smaller, then this cut here would run into here, and you wouldn't be able to have this cut this high, so if you can imagine this line, if I moved it over 30,000ths, it would start intersecting there, and you wouldn't be able to have that cut as high. So I suspect that this is an intentional design decision to allow them to have a wackier key bidding at this point, deeper into the keyway, thereby making it, for example, harder to reach this guy here, so perhaps adding additional security to the lock. So it's a very interesting observation that despite having spent a while with this lock, I had noticed, for those of you that like lots of numbers, so here's the pins, and so what I did was I took my caliper, and I used the inside caliper function to measure the space between the outsides of the bores. If you can imagine this, measured edge to edge, inner edge to outer edge, subtract out one diameter, that gives me the center to center distance on those, and then of course this one is bigger. Okay, so these spacings were this measurement from here to here, 0.31 inches or 7.87 mil on this and this. On the three to four spacing is 0.34 inches or 8.67 mil, and so that gives us a difference of 0.30 mil on the spacing, and then you can see it here, a different format on the table. I've not seen that before. Maybe other people have seen locks that do similar things. This lock is made by our friends at ASA Abloy, so I don't know if anyone is aware of any other ASA locks that have this sort of feature. You have to stare at the key pretty hard to see the difference. It wouldn't be immediately obvious, because it's only 30 000s, but looking at the top of the cylinder, it's very obvious the difference. So anyway, I thought that was pretty cool, and thanks to Sideshow Mick for pointing that out. I would never have noticed it, probably because I had already put the lock away. So thanks to Sideshow Mick for pointing out this interesting feature of this lock. If anyone else is aware of locks with similar properties, please throw in a comment, be interested in learning about that, and yeah, so we learned something new today. Thank you for watching. Please subscribe to my channel if you like my material, and as always, have fun with your lock support while keeping it legal. Cheers.