If your vise didn't come equipped with a material spring, you owe it to yourself to get one. If you have one, why not a spare? A small but indispensable accessory. Will fit on most vise jaws. Regal Medallion and many other spring action vises require 2 springs hooked end-to-end.
JStockard has a great line of vises,bobbins,bodkins, threader, hair stackers, hackle pliers and more. As well as amazing fly tying kits. These are very good quality for sure.