Modifying Your Locking Device

Over the last few years, I’ve likely tested around twenty different cages looking for one that fits properly and keeps things securely in place. My goal is to be prepared before I bring it up with my wife. The main hurdle has been locating a cage where the ball gap is just right to stop escapes. A couple of options were close, provided I didn’t cross my legs, which tends to force my balls through the opening. I’ve experimented with changing the ring size and gap using PlastiDip, but it wasn’t particularly successful, and I’m worried about health risks from long-term chemical exposure. Ideally, ordering a custom cage is the way to go, but I want to ensure my measurements are spot-on first. Does anyone have other tips for adjusting the ring or the cage itself to reduce that ball gap?