[wolfox]

Yep, a dent in the tube can restrict movement of the piston inside of it. Get it checked ASAP and see if they will cover the cost of the new shock too. Having installed plenty of my own, it's not hard to do and there is no excuse to damage one in the process of installation. Gas charged shocks can be a little tougher to install. Once the band over them is released, they slowly expand with internal pressure - and once extended, impossible to muscle into place. Usually one mounts the bottom of the shock, cuts the band and guides the upper mount into place as it lifts itself up into place. He may have gotten into a little trouble if he did not realize this until it was too late and had to "beat on it" to get it to go in. As I said, no excuse, indeed have them look at the work and replace the part on their dime for the damage.