Just got a Holy Trainer v5. Im not new to chastity and have been watching this series for some time. A friend has a HT and recommended it. My issue with my CB6000S which fits well is that the tube is too long. As Ive aged, I am smaller. I need to go a aize lower. So I bought the HTv5 in the Nano version. Been trying it since last week. The Nano tube is perfect. For length and width. And I like the internal licking method. Whats stumped me is the ring. I measured myself to be a 45mm. But it was so tight, I quickly turned dark red and mybtesticles grew cold. It cannot be healthy. I made it about 15 minutes. Reading around it suggested the ring was too small. So I broke down and orsered the next size up ..the 50mm. This is shaped a bit better, and gave me a bit more relief. I made it 20 minutes two different nights. Until again, dark red testicle, especially the right one, and both cold to the touch. The tube is such a good fit. And I dont have that much trouble getting the pieces in place. But it is not comfortable at all and the blood is obviously being cut off. I like this device, but do not want to hurt myself. Im seeking ideas...is this device doable? A couple other notes...one testicle is quite smaller than the other so a anug ring is preferred. With the CB series, I could slip my smallest finger some under the ring. No way with this. And I have a very high and tight ball sac. I think thats the issue...and that the device only allows a 1/2 space between the ring and tube. Like this device and its quality and desitn...but may not be for me with hiw Im built?