Ring stretcher and reducer — Swan neck

Lever tool (Swedish: svanhals) for enlarging or reducing ring sizes and truing rings round. The mandrel is graduated in circumference (mm). Always measure the inside of the ring.

Swan neck ring stretcher

How to use

• Enlarge: slide the ring onto the mandrel and push the handle gently backwards. Repeat until the ring is the right size. Flip the ring between pushes so it doesn't become conical.

• Reduce: place the ring in a tapered hole in the round plate below, choosing a hole where the ring sticks up a little above the plate (see photo). Pull the handle gently towards you. Flip the ring between pulls.

Reducing a ring in the plate

Circumference to diameter (mm)