Tilt control for tiltable mount

An adjustment mechanism comprising:

• a first bracket;
• a clutch means comprising a first part and a second part, said first part coupled to said first bracket, said clutch means configured to permit rotation of said second part relative to said first part in a first direction but not in a second direction that is opposite to said first direction;
• a friction means comprising a third part and a fourth part, said third part coupled to said second part of said clutch means, said friction means configured to adjustably resist rotation of said third part relative to said fourth part;
• and
• a second bracket coupled to said fourth part of said friction means wherein:
• said clutch means and said friction means are arranged about a common axis;
• said second part rotates about said common axis relative to said first part;
• said fourth part rotates about said common axis relative to said third part;
• said friction means can be adjusted to provide a first amount of resistance to rotation of said fourth part relative to said third part within a range;
• and
• said clutch means permits rotation of said second part with respect said first part with a second amount of resistance that is less than said range of said first amount of resistance of said friction means.