I've never tried cutting a spring down. Seems like that might weaken it a bit. You should always use a good lubrication. I use Slide Glide (or Break Free) on the rails and barrel lugs. Slide Guide is a high pressure grease that was made specially for high wear surfaces. A word of caution concering replacing the recoil spring. Be verrrry patient. Since it's a bit stiffer than the stock spring it can be a little harder to install. I field stripped it per the instructions, put the barrel in a padded vice then removed the stock spring. To install the new spring i reinstalled the barrel, replaced the bushing,installed the spring on the guide rod and pushed the assembly through the slide. Happy shootin'.