Difficulties with wearing a device? discussion

Hi there, I’ve been playing around with chastity for several years and now own five inexpensive cages that mostly fit. Every single one of them is slightly off in at least one way, and I can’t quite figure out what the ideal tube size actually is. To me, the perfect fit means a tube that keeps everything contained when I’m at my smallest, with the bars touching all around. *Especially regarding length. I don’t want any space between the tip of the cage and myself, nor do I want half my shaft sticking out from behind the base ring. Some instructions suggest taking your measurement right after a hot shower, but that method hasn’t worked for me well. Using that approach, I measure 5 inches long, which seems quite inaccurate. Other guides recommend taking several measurements throughout different times of day over a period of time. That feels like the best technique so far, yet even with it, I ended up getting a cage with a gap at the end. Do you think any measuring guide is more reliable? The reason I’m asking is that I’ve been considering spending hundreds on a custom-sized cage. However, from what I can see, most sellers don’t offer size guarantees or make adjustments to the tube dimensions. There aren’t many places offering custom cages anyway, but I certainly want to avoid wasting money due to incorrect measurements. I could purchase between 10 and 15 more cheap cages for the cost of just one high-quality metal cage before breaking even. Thanks in advance for any advice.