Lever addict makes a fine point. Be careful. The reason I decided with the springs I used was of the nylon bushings provide a friction reducing guide for the hammer strut. You can also adjust spring tension to suit your needs. And you still have the original unaltered hammer spring you can either put back or repair one of your other Marlins.
Easy-to-install components let you fine-tune your Marlin lever gun for a smoother-operating action and more consistent trigger pull without making permanent alterations to the rifle. Simply replace the factory hammer spring and lever-plunger spring with the springs from the kit, then use the color-coded nylon bushings and adjustment washers to select one of seven hammer spring tension settings. The difference between each setting is about 8%, so you can get the hammer spring tension that suits you best simply by choosing the right combination of bushings and washers. Tough, friction-reducing nylon bushings keep hammer spring aligned and prevent it from crawling over the front of the strut or Mfg: Palo Verde Gunworks SPECS: Zinc-coated steel springs, nylon bushings/washers. Kit contains hammer spring, lever-plunger spring, (2) white hammer spring bushings, (2) blue hammer spring bushings, (4) red adjuster washers, and instructions. Fits Marlin 1894, 1895, 336, 444, 39A.