After more than a decade of searching and over a thousand dollars wasted I finally have found a chastity device or two that isn't horrifically painful and may be suitable for longer term wear. As much as I didn't want to purchase a third steel device in under a month, I figured it was worth another $26 to see if this would be the magical fit (I am not using it with the catheter tube as that freaks me out).
This device came with a spiked anti-pullout ring add on but before I was able to even get it on it immediately felt like this is a tetanus risk waiting to happen. It should fit on all 3 devices.
The alternative is to go with the longer tube version of this device that I received last week.
The big positive is that between these two devices, I'm fairly certain that I will be able to find something that will work.
I wouldn't have learned enough if not for the struggles with the Holy Trainer V2 that I went through earlier this year. I am glad that I was willing to give these cheapo devices from Amazon a chance. All three locks are keyed alike, so I basically have 3 locks and 6 keys in case any of them break. I also have 2 rings that are good fits and 1 ring that is a bit snug but could possibly be moved to if anything changes over time. All of the cages will fit on all of the rings although a couple of them take a bit of jockeying to get locked. The regions meant for the lock aren't exactly machined to exacting standards... I'm guessing they had to bend some things on every single device to make sure it would take a lock. I'm out about $80 on the three and I'm feeling pretty good about that considering I have some extra hardware and have spent about half of what most devices cost. I also have a reference point for if I want to go with something higher quality in the future.
And now... my OCD can rest.