Paavo Tynell Counterbalance Diffuser  

Hello--I recently picked up a Tynell counterbalance that needs a bit of work.  The first project is that the diffuser is missing.  I was planning on taking it to the glazer for a piece of milk glass, but I've been looking around and it seems like maybe a fabic diffuser is what is proper?  Do any of them have glass?  Would it be off I put glass in?  If I need to put fabric I supposed I'd have to go to a custom lamp shade place and I suspect that will be a good deal more expensive.Thanks in advance for any tips.  (The pic isn't mine-- but just a pic of what model I have).Mark