My drivers side camper mirror hangs up and will not extend sometimes, without a little help to get it moving. Sometimes it works Ok for a few times. On another forum I read about a fix by removing the mirror and tightening a clutch. I have looked and looked and can't see how the mirror comes off so you can get to the power drive. Supposedly just release a clip to get to it. I even have the factory service manuals and can't find anything other than replacing the whole mirror assembly. Anybody here done this before?