This custom coil spring with a 2lb 4lb 6lb force will do just that. The regular force in a JLF spring is .9lb at dead center. These springs can provide approximately double, fourfold and sextuple that force, giving you a stiffer more controlled feel to your JLF. Our new line of springs allows you to modify your JLF without cutting or stacking springs. And 3 different tension forces you can choose, You always can find one of the best you need.