Unfortunately Daniel can't measure worth a darn. Or he measured pre-production models. Every Reuleaux 510 pin travel I ever measured was 3.9mm to 4.6mm. Even Wismec says 4.6mm.
3.9mm of pin travel?
I'm not sure you know what pin travel is. It's how far up and down the pin moves. And I can assure you that there is no possible way for the Reuleaux to have even 1mm of pin travel. The entire connector is only 3mm tall. They rely on the body with it's raised ring to hit their mythical 3.9mm depth.
Here, let me show you something....
There is the 510 connector in your RX200. See that screw to the right? Open your mod, remove the batteries, and unscrew one of the center screws from the battery sled. That's the screw you see in the picture. See how tiny that screw is? Now you've got an idea how small that 510 connector really is. And the pin inside of it only moves about .5-.7mm.
Also you'll notice that the 510 isn't actually held in place by anything. It's slid into place in tiny rails built into the body of the mod and is then held there by the back of the battery sled. Remove the battery sled and it slides right out. That of course also means that it can be wiggled around if your topper doesn't sit flush.
That is by far the cheapest and crappiest 510 connector I have ever seen.
That's mine. That works SO much better and eliminates every problem that the RX200 510 connector causes.