The tailgate on my Signum bounces when I try and shut it - needs a\nreal slam to close. Want to try and wind both bump stops in a few\nturns to see if it improves things, but....how do they adjust? Looks\nlike you should just turn them, but they just spin but don't move in\nor out. Any ideas?\n\nI guess they are the same as on other Vauxhalls with a hatch or\ntailgate. Black rubber stop, mounted on a threaded post fitted to the\nframe of the rear door opening.\n\nThanks for any info. Jamze.