Simon decided to make a finger tab due to hisgeneral dissatisfaction with the comfort and construction of the tabs that were on the market. It has always bothered him that the screws on most tabs always work loose, and the spacer moves, and the shelf is sharp edged - unless you take to it with a saw and file...
What he has designed is a tab which can fit - without adjustable parts. It is modular instead, using three separate sections that come in different sizes to allow you to fit the combination to your hand. The plates come in three sizes, and the spacer/ring module in 9 different sizes. They all fit together in a manner which prevents any movement or slipping of the shelf or spacer, and uses only a single screw to fasten it all together. So changing the leather is now a quick and easy process - no need to remove all those screws, spacer and finger straps, the single screw does it all.