Chastity device reviews discussion

Hi everyone. I’m new here. I was going to post this in the Birdlocked section but decided to put it here since more people seem to visit this forum regularly. I took my measurements as carefully as possible and then bought a Birdlocked Neo because it looked like the best choice. Just so you know, I measure about 2.3 to 2.5 inches when flaccid and 6 inches erect. However, I have a bit of width. But there are some problems that haven’t been discussed much regarding this device… I lubricated both my body and the device with vaseline, but I couldn’t get my testicles through the ring. Then I tried soaping up my penis and balls; this nearly worked. I managed to push one testicle through but not the other. In short, I almost strained my left testicle trying to force it in, so I gave up. As an experiment, I checked if just my penis would fit into the cock sheath, and apparently, it isn’t wide enough. The strange thing is this… The Birdlocked Neo claims to have a fully adjustable cock ring that expands from 45mm to 52mm. That was one of the main reasons I chose it. But HOW does it expand? How exactly is it adjusted? You tell me, I’m clueless. There isn’t any built-in adjustment mechanism with the device; the only way to widen the ring seems to be pulling it open manually until you eventually break it. So now I feel like I wasted my money. I am currently considering two replacement devices:

1. The Bon 4 Plus Complete Set — It’s similar to Birdlocked products, but Bon 4 is nice enough to include multiple cock ring sizes unlike Birdlocked. However, I’m still hesitant because with the Bon 4, you still have to PULL your testicles through the ring, which was a painful experience for me. So that remains uncertain.
2. The CB6000 - I am unsure about plastic (is it some kind of plastic?) devices generally, but there are two things I like: It comes with various sized cock rings; and you don’t have to PULL the testicles through. Instead, you just cup them from underneath and secure the ring onto the cage above, which is quite simple. I am leaning towards the CB6000, but not sure yet. I want something comfortable for long-term wear that doesn’t create a noticeable bulge under clothes. Any insight or advice?