I've been using my WRS for over 4 1/2 years now after getting it in the fall of 2008. One of the first items I added was a groundglass and flexible focusing hood (WDS-619 and WDS-616). In all fairness I tried to find the love in this combination, but couldn't. I found the act of changing the back to the groundglass to be cumbersome and felt the back was in danger. The dangerous part for the back was it had to be removed along with the mounting plate in order to insert the groundglass and there was no adequate method to protect the back with the plate on. I ended up removing the back and protecting it using it's own cover then removing the mounting plate before placing the groundglass on the body. Very cumbersome and I quickly tired of it, to the extent I sold the groundglass and focusing hood.
Universal Groundglass Frame