Im very high right now, and I broke my ROOR not to long ago. I've seen plenty of threads on here about broken ROOR's and what not. Im not sure how to many of them break but the joint on mine broke. Unfortunately, I dont have pictures. But basically what I did was cut the top off of a 2 liter bottle, lined it up with the broken piece on the ROOR wrapped electrical tape around it and thats it. Downstem fits perfectly, and it will never break agian!
Omg dont ever use it like that, that completely defeats the purpose of using high end glass like that. There are plenty of people that will repair it for you for around fifty bucks, pm me if you need to be pointed in the right direction.
If it's a genuine ROOR there is a web address for the authorized roor repair shop printed inside the box. Use them... they're very good at what they do.