welll.....since this is the internet and people can type anything the want ,,,here is my .02 $$...I have fooled with lots of springs on dirt track and drag cars and worked on spring hangers that hold 30-50 tons each and the spring is large enuff for a small man to crawl thru,,,,a coil spring is a torsion bar that is wrapped into a coil,,,when you compress a coil spring you are twisting the entire length of the spring ,,not rotating the coil,,,with "dual" springs the reason the inner and outer springs are coiled in opposite directions is to avoid the coils from falling into one another and becoming "coil bound".....when a spring weakens it looses its ability to return to its original relaxed ammount of twist ,which is what we see as a short mainspring in a modern bolt action rifle,,,,I have been shooting competitively (NBRSA-IBS)for over 50 yrs and know the importance of a "fresh" spring in a rifle,,,I shoot Kelbly actions and have had two spring issues over the yrs which were my fault for not realizing that they do wear out,,,,dont fall for every gimmick that is 'claimed' to improve pin fall and lock time,,,,Roger