Pan/tilt/roll mount to attach anything with a 1/4-20 mount thread to a T-post. I use it to position and mount game cameras. 

Hardware required:

• [1] 5/16" x 2" x 3-¼" U-Bolt
• [4] 5/16" Hex Nuts
• [2] 5/16" x 2 Hex Head Bolt
• [2] 5/16" Washers
• [2] 5/16" Lock Washers
• [1] ¼"-20 x 1" Hex Head Bolt

Assembly: