One of our bed frames is a custom made futon frame that was made by a friend of a friend probably about 20 years ago. The frame is held together with hidden threaded rods, which use this type of half-moon shaped washers in the access hole.
Unfortunately it looks like the bag containing the fasteners got lost during the house move over here and I need to find replacements for the washers so I can put the frame back together. Well, or buy a cheap(ish) bed at Ikea, it's for our guests anyway. However I do like the frame and would like to keep it.
