Difficulties with wearing a device? discussion

Hi, I’m struggling to get my new device (a Chinese steel one) on properly. I’m still fairly new to this and would appreciate advice from those with more experience. The first issue is putting the ring on; my balls seem to disappear into thin air. Usually, I can push one through while the other retreats somewhere else. I don’t have particularly small or high-and-tight anatomy. My old device was a copy of the CB600 and that fitted well—I suspect because its two-part design made it easier. So far, I’ve only managed to get this steel ring on after a shower. Once I finally manage to secure it despite all the hassle, one ball slips out within an hour or so (it hurts!). This suggests the ring might be too loose? I’m using a 50mm ring, which was the same size that worked with my CB600s. I also recall trying a 45mm ring with the plastic cage before and finding it quite tight. Thanks