Step 1: Materials
You will need lead free solder, a zip tie, and a piece of pipe close to the diameter of your finger.
Step 2: Measure Your Finger
Wrap the zip around your finger and mark where one end meets the zip tie.
Step 3: Find the Right Size Pipe
Using the marked zip tie, find a piece of scrap pipe close to the diameter of your finger.
Step 4: Bend the Solder
Clamp the solder in a vice near its end against the pipe. Wrap the solder around the pipe. You may need to re-position everything several times in the vice to get a full wrap around the pipe. Once you've completed a revolution, remove from the vice and continue wrapping the solder around the pipe by hand.
Step 5: Cut and Sand
Once you've made the number of revolutions you want, cut the solder and sand the ends to remove any sharp edges.
Step 6: Final Adjustment
Some adjustments may be needed if your pipe wasn't an exact match of your finger. Carefully bend the ring to tighten or loosen as needed.