This was made to mount a small projector on the ceiling of an RV. Hardware list: Qty 2 bolts. 1/4-20 x 1-1/2" long. 7/16" hex head. Qty 1, 1/4" flat washer. Place the washer between the mount body and the knob to reduce friction while tightening. Use 1 bolt to thread into the round projector mounting surface. It should be a tight fit and thread all the way inside. Then cut off the head of the bolt, leaving about 3/16" exposed. You will need to carefully clean the end of the threads where they were cut.

The 2nd bolt holds the parts together and threads into the knob.

The photo shows the mount before I added the mounting holes. I was going to use double sided tape.

Could also be used as a camera mount.

Updated 9/20/18 I've added some additional mounts for a 1" square bar.

The square bar slides into the 1" bar mount bracket. It extends outward from above a cabinet. The projector can mount with either a Ram mount style, or with a snap on square bar adapter, or with an end cap for a 1" square bar.