The door on my MH was getting harder and harder to close without slamming it. I had the same thoughts you did about taking some of the strength out of the spring. However, upon closer examination I found a missing screw from the door latch. Replaced that, tightened the other screw and it was much improved. Still makes a lot of racket but it closes much easier now. I can actually just push it closed rather than slamming it.
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Don
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