I have no pictures, when I sold the business I took the bench and rollers out. Sorry.
It is easy to make. I bolted the rollers (large bolt) to the side of the bench. Place the rollers so one will be in the grip and the other about 8" or so from the limb tip. I just my arms/weight to bend the limb back over the roller to string and unstring. I believe Black Widow has something like this in their shop. It works well to prevent twisting limbs. If you string and unstring a lot of bows, it is very helpful.