Assistance needed with sizing rings...

I recently purchased the plastic sizing rings from MM, but I’m struggling to put them on. Even with some lube and using the largest ring available, it’s hard to get both testicles through and keep them seated securely once they’re in place. They have a tendency to slip back out. Does anyone have any tips?

Make sure you draw the scrotum skin through first, then effectively "cuff" it by placing your thumb and finger behind the ring while guiding your shaft through. Once everything is seated correctly, they should stay put. MsM's ld