Retracting or Slipping Out? Managing a Mobile Testicle in Chastity

I’ve struggled with several cages over time and wanted to ask for advice from the experienced members here. I am in my mid-50s and started exploring chastity three years ago. One of my testicles keeps retracting into my body when I try on any cage. If I use a smaller ring, it pinches the skin quite a bit and causes numbness after a while. Sometimes even with a tight enough ring, one testicle will still escape. I tried tying them off with rubber bands before putting on the cage, but that didn’t help much. Does anyone know how to handle this issue? Should I just endure the pain and hope I get used to the pinching and bruising over time? Is there a way to stop my testicles from retracting into my body while staying inside the chastity cage? Any feedback would be appreciated. Warm regards, Rebus