From time to time we discover a simple solution to a long-held, oft-mentioned problem. It's such a thrill when we find the answer; and here it is.
Do you have a ring that is too big for you? Or large knuckles; so a ring that fits over the knuckle is too big for the slimmer part of your finger? Or a ring that spins to the side when you wear it? Or a ring that is too complicated or expensive to have made smaller?
A small spiral of this coiled TPU can be wound around the back of the shank of the ring to bring it down by a size. A 10mm piece will reduce it by one size, and a longer piece will make it even smaller - your choice, as you just cut it to size. It works brilliantly on fine to medium sized bands, and stays put (unlike some of the other methods we have seen; elastoplast or even duct tape!) £4 buys you a 50mm strip that you can cut to size.
The boring bits: the Universal Ring Resizer is made from TPU - thermoplastic polyurethane - a class of polyurethane plastic with many properties, including elasticity, transparency, and resistance to oil, grease and abrasion. It is, of course, non metal and therefore will not cause allergy.