Hinged Ring

A few solutions exist for allowing customers with arthritic knuckles to wear rings. 
One involves placing small balls at the 4 and 8 o'clock positions of the band. 
These balls (colloquially known as speed bumps) allow the ring to slide over the knuckle but reduce spinning on the thinner part of the finger. 
Another design feature is to make part of the ring hinged, so it can be placed directly on the lower part of the finger and avoid the swollen knuckle. 

We made a wide ring from sheet and cut it in half (although a smaller hinged section is also possible to be less conspicuous).

Slivers of metal, equal to the diameter of the previously made tube, were removed from each half.

The tube we had made on Friday, was cut to slightly more than the width of the ring and then half-cut through in two places along the solder line, forming the 3 knuckle sections.  On the second half-cut, the saw was turned 90 degrees and a long flat bottomed U shape was formed.

The cut tube was then soldered to one end of the ring piece along its solder line.
This allowed the bottom of the U to be cut away.
This was repeated for the other half of the ring.

With the aid of some steel wire and tip-ex, the single knuckles (cut to precisely fit in the gaps) were soldered into place.

A simple rivet was used to form the hinge, and a safety chain and pin were added to secure the ring in place.