I have the Birdlocked Classic, 45mm, and it's a snug fit to get on. However, after a day or so, my left testicle (which is the smaller of the two) always manages to find its way up past the sheath. Once there, the device is at risk for sliding off. I generally put the device on in the shower, and use soap as the lubricant. I can then wash the soap off so that the silicone does a better job gripping, and not slipping. Any suggestions for mods to keep the naughty boy from running away?