Anyone have a Treadclimber tc100?

So ive had this thing for a few years, barely used it. When i first got it the first thing i noticed was when taking a foot off one of the treadles while walking, the shock on that side would close and make a loud knock/bang sound. I called Bowflex and they sent me new shocks but no real answer to why other then probably bad shocks.
So after i got replacements it still does it. I tried adjusting the levels on the shocks but nothing seems to prevent this. To me it seems there should be some type of rubber washer preventing the rod inside the shock from slaming into the top of the shock.(thats the only cause of the loud banging sound i can see happening)

Anyone else have this machine, and experience the same thing?

Other then that, i love this machine. Best way to burn crazy amounts of calories without killing my runners knee's.