A couple of things:
The Radius bottom plate is spring loaded.
It is important to hold it firmly pressed against the polycarbonate body when installing the screws. The screws need to be well and truly tightened down.
The screws will back out if there is any play at all.
Use a glove, if need be, to make sure. These screws can really chew up your fingers.
Number Two...
The 510 needs to be tightened wih a coin.
Overtightening an atty is not such a great idea.
The biggest problem is caused when removing an atty.
It is essential to make sure to only loosen the atty and not the beauty ring.
You will lock up the whole shebang if you start loosening the atty and then inadvertently screw the beauty ring up against the atty base.
This is easy to do because the beauty ring is wider than the 22mm that most
mods and attys adhere to. So, when you go to grab the atty, watch out for that beauty ring. It is better to hold the
mod and beauty ring firm, and then remove the atty.
I did this once and, as I recall, the solution was counterintuitive, involving screwing the beauty ring even tighter up against the atty base, then screwing it all back down, and holding the beauty ring firm while removing the atty; but don't hold me to it.
The main thing to remember? That beauty ring needs to be down, all the way, anytime there is an atty anywhere near it.