[Jewelry making - Article 00030] - Re: [Orchid] Adjustable Ring?

[Bruce D. Holmgrain]

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>     I would agree with the selection of superfit rings.. 

    Superfit requires the use of the entire shank as the spring. This
    becomes a problem, as all springs required uniform thickness along
    their length to spread the forces of bending evenly. When a head is
    attached to 1/2 of the spring, that half can no longer react to
    bending forces regularly and all of the bending is forced to be done
    by the other half. If the ring is particularly small, that half of
    the shank will bend permanently and not return. This all results in a
    loose/sloppy fit. It can be tightened until the cows come home, but
    will soon result in a sloppy fit. Compound this with the fact that
    the lock is basically a friction fit and failure is a regular result
    with small and or platinum shanks (which do not make good springs).
    Use some care when trying these out.

Bruce

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