Chastity device that keeps slipping out?

Hi. I have a jailhouse chastity cage. It’s my first “serious” device. But there’s an issue… The rings that came with it are 40/45/50 mm. The 50 is way too big for me. The 45 felt quite good, but after some time I realized I can slip my cock out of it. I tried the 40mm ring, but it was much too tight initially. However, once I got used to it, I found that I could flip out of it just as easily as with the 45 - without needing lube or water! I have a lot of loose skin on my penis and scrotum. Also, my penis is quite flexible and erects horizontally (not upward). For reference - 17cm when erect, 7cm flaccid. All this makes it very easy to slip out the device… which kinda ruins the experience. I want to buy a new belt and I see two clear solutions: either a PA pricing model or a waist-fastened belt - but I’d like to avoid both options. Did anyone else have such problems? What cage would you suggest?

I am also using a Jailhouse cage for the last 15 months. I started with a 50 mm ring and after a few months shifted to the 45 mm ring. I think, in your case, you should try the 40 mm ring. Although initially it may fit a little too tight, soon you will get used to it. You can also try reducing the gap between the base ring & cage by grinding down the two posts (about 4-5 mm) that fit into the base ring. However, in this case, you'll have to add a 4-5 mm spacer before the lock. Finally, just don't make any special efforts to pull out while locked; and you'll start enjoying the chastity lifestyle!