Trying to fill the need for a rear view mirror for a family member's electric wheelchair, I came up with the following.
I wanted to make something that could easily be adjusted by someone with mobility impairments as well as installed and removed from the wheelchair without tools.
There were two mounting options: Headrest support and arm support.
I figured mounting off the headrest support would put the mirror closer to the head and eye and also reduce the required length of the flexible arm.
Step 1: Materials and Tools
2" mirror on 16" flexible shaft - $5.99 from Harbor Freight
5/16" eyebolt - The eye of the eye bolt acts as a handle for tightening the end of the bolt opposite the wing nut.
5/16" wing nut
(2) 5/16" washers
Step 2: Cut Handle to Fit Headrest Mount
Using a hand saw, cut halfway through the thickness of the handle to suit the angle (if any) of the headrest mount.
Next, cut the handle lengthwise from the tip to the previous cut line.
Save the cut-off for clamping the handle to the headrest mount.
Hold the two pieces together and drill a 5/16" hole through both.
Step 3: Mounting
The two handle parts sit on opposite sides of the headrest mount and using the wing nut and washer on each side clamp the handle parts down to secure mirror to headrest mount.
Haven't tried it out, as I need to get it there, but will post a picture after it is installed.