I am hearing some hollow sounding bumping noise when going over small bumps or divets. the shocks are fine but the bump stops attached to the inside of the rear heavy-duty rear coil springs looks like they have deteriorated somewhat. I believe this could be the problem sound that I am hearing and feeling. Would anyone who has had to replace the bump stop could you please send some "how to do it" information about replacement procedures? I thank you up front for your effort and time.