I should have listened to other reviewers. This is by no means a high performance spring. I installed a 3ft Firestik antenna on it. This spring flexes and begins to rock back and forth during normal vehicle movement. Something as small as going down the incline of the driveway makes it clap. I don't even think it classifies as a medium-load spring. If you want a stiffer spring, this is definitely not for you. I put off the install so my return date has passed and I'm stuck with it. I'm already looking for another reinforced spring.
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