How do I adjust rotation with discrete stops?

why not use an automotive/truck mirror bracket...
there are a zillion bracket assemblies to choose from...
https://www.iowa80.com/browse/brackets-and-braces-for-truck-mirrors/MIRRBRCKT/UNI/

Both good notes about the attachment points. I would have opted for different ones, but unfortunately this application required this arrangement for several reasons. The mirror needs to:

• Be above the existing, useless, management-installed one
• Be be tall, to be usable from vehicles of significantly different heights
• Be elevated higher than this pole to provide adequate view
• Extend out from the pole toward the street to provide adequate view
• Not extend out any farther, because trucks will hit it

It seems to me that changing the attachment points by extending the pipes wouldn't change the forces exerted by wind and weight.

I don't think that truck-mirror mount would support this thing or provide enough resistance to pitching downward (because of that smooth piece of metal), but good suggestion. I might look at other designs.

Ha, thanks for all the brainstorming, people!

The current design evolved out of doing it as inexpensively as possible using only the wooden post that the management put in. But... recently somebody dumped a really nice 2 x 4 next to the building, which I could indeed secure to this post to extend & widen it.

The number of joints I used was the only way I could (under the above limitation) figure out to allow adjustment in two planes. But yes, it's probably best to abandon these limits, put the taller & wider board up, and use metal pipe with U-clamps affixed so the horizontal pipe crosses the vertical center of the mirror, as @Nickp suggests.

smitty10101 said:

Must the mirror be as pictured? Flat & square?

Click to expand...

Absolutely yes! Convex mirrors are wholly misguided in a driveway application. They show you the sky, the building behind you and across the street, yourself, the sidewalk... when the only objects of interest (cars coming from the left) are tiny specks with grossly distorted proximity. They're quite dangerous, and one resident's car was already totaled even with the management-supplied convex mirror in place.

You only need to see the cars coming from the left, so in this case the total field of view only needs to be two lanes wide. That's easily accomplished with a flat mirror, which provides a large, undistorted view and accurate way to judge distance. The building residents loved it and have been lamenting its breakage for months.

Here's what I ended up going with. It reflects (har har) several improvements as suggested in this thread, and some that became apparent as I put it together. It's not as high as the previous one, but if I need to raise it I can.

The bars are 1" conduit. Mirror tilt is secured by a metal strip with holes in it. Clockwise yaw is prevented by a stop-screw in the top of the pole, counter-clockwise by a wooden bar pressing against the back of the mounting board.

A key find was conduit-couplers with set screws; I cut them in half to make collars and caps that I could slide over the conduit and lock it in place to prevent it from sliding out of the U brackets.