Those of you that use the SuperFit product should not be too pleased
after reading these two paragraphs taken from an engineer's report on
He had five out of five total failures that cost him $10,000.00 in
lost time and parts to replace them with the P.F.F. Ring Clasp. The
five rings were all with different customers. So it can not be blamed
on a rough customer.
One that failed had a 3.06 CT. E VVS1 on it.
All five rings never stayed closed from day one and after multiple
returns every couple of weeks to the store they all had to be
replaced, all within a few months of brand new. The famous nubs were
all worn down.
But even when the rings are new the nubs only have 2-10 mm of nub on
the speed bumps. That is the thickness of tissue paper
Excerpt from Engineer's report on the SuperFit
Further thought regarding the design of this product and its
inability to be reliable is rather disturbing. Examination of the
mechanism will reveal that although there is a perceived latch, the
mechanics of the design are self destructive. Essentially, the
mechanism is no more than an interference fit. Two interference
profiles, which attempt to mate when the profiles are phased past
each other and come to rest in non-interference, tension free space.
Simply put the same type material gold on gold rubs each other, there
is no true mechanical advantage which prolongs the life of the
design, it is a known fact (Scientific Phenomenon) that like
materials are abrasive to each other when like surfaces come in
contact. Therefore the nubs of the SuperFit upon opening and closing
of the product will eventually destroy its self.
No tweaking or shape manipulation of any kind to the rings is a
sound solid method to adequately adjust and maintenance the latching
of the SuperFit
From an Engineering Standpoint "The SuperFit System" is designed to
fail which it has. Any like material the friction rubs together will
in fact destroy itself, a foregone conclusion. In no way can that
type of design ever survive reliably with any degree of certainty and
when that system is used to secure diamonds poses a serious risk,
liability and potential loss and or damage should the ring unclasp.
P.O. Box 51 Cote St-Luc
Perfectly Fabulous Fit Arthritic Shanks