So I've read a lot of the threads on his for various devices and on other sites about sizing but I just wanted to run it past here as there is so much collective wisdom on this forum. I have been using the CB6000 and CB6000s for some time now and have been playing with the sizing to get an idea of what works. A-Ring, I find the 47mm most comfortable with CB6k devices. The 45mm is fine during the day but it wakes me up with a lot of pain in the mornings. The advice on here seems to be that with a steel device it is often worth going down a size, does that sound sensible? I was planning to get two a-rings just so I can be a bit more confident of getting the best fit and maybe I get used to a smaller size. So my question would be do I get a 47mm and 45mm or a 45mm and 43mm? Cage diameter, I find the CB6ks a bit restrictive and can definitely only get them on using the stocking method and so I was tempted to get a slightly larger diameter. Cage length, most measurements for flacid length seem to come to around 80mm and so based on the advice of taking 10 - 20 mm off I was inclined to go for 65mm. I much prefer the CB6000s over the CB6000 as whilst the larger one is great for when things get a bit enlarged most of the day it is a lot of wasted space which makes the device bigger than it needs to be and makes it less comfortable for a lot of activities and clothing. Just wanted to see if people saw anything obviously wrong with the above or if it seems about right?