Instructables
Picture of I built this bike trailer
I built this bike trailer out of an old jogging stroller.

Step 1: The Hitch Mechanism

Picture of The Hitch Mechanism
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Hitch mechanism made of 3/4" flat stock and a Quick Disconnect Type 3/8-24 Fine Standard Thread Ball Joint and Rod End. http://www.amazon.com/gp/product/B002HAUWCM/ref=oh_details_o01_s00_i00

$18 with shipping

I made some teflon washers to go against the bracket and tightened the backnut against the joint to allow a little slack for y-axis movement of the arm beyond the ball joint movement.

Step 2:

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I made the mounting bracket from a zinc plated strut pipe clamp- $0

Step 3: The Tray

Picture of The Tray
The wheels and from were from a jogging stroller that had been decaying in the back yard. The box is a spare drawer from our kitchen remodel. $0

Step 4: Tubing

Picture of Tubing
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The tubing was from the jogger handle. -$0

 I used stainless deck screws to fasten the tubing to the tray.

Step 5: In use

Picture of In use
The trailer loaded with 5 bags of ice, 12 pack of soda, and some misc groceries.
 
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