The Miroku is fairly easy to lighten up. If you take your time with a dremel turned fairly slow and work the sides of the spring slowly so and in shifts so to speak so it does not get hot you can make it the way it feels best for you. The only screw to loosen is the small one that puts more tension on the spring. You can adjust it also but do not ket it be loose cause will fall out. As far as springs also do the same with the carrier and lever springs. If you take your time you will have a great running rifle tuned the way you like.