How to build a Bench Swing Support Frame
Step 8. Attach the swing chain
Now it's just simply a matter of hanging the bench swing.
Insert two 150mm (6") bolts through the beam above the bench swing, one at each end.
The bolts will protrude above the top of the beam by about 50mm (2").
A chain link can then be fitted over each bolt shank on top of the beam and held in place with washers and nuts. See fig.16.
For plans and instructions on how to make a bench seat go to www.buildeazy.com/benchswing-1.php