I looked for instructions on how to build a see saw swing out of wood. Couldn't find any. BUT lucky for me my neighbor had a swing so I had a reference for measurements.
3 8ft treated 2x2's ( had one 10 ft 2x4, and I ripped it on my table saw)
scraps of ply wood, or planks for the seats
4 5 1/2 inch bolts (I used 6 inch)
1 1/2 inch (ish) screws
3 inch screws
2 7ft long (swinging bars)
2 1 ft long (foot rests)
2 3 ft long (seat supports)
2 14 in long (swing supports)
Then cut the seats
They are about 10 inches front to back, and 10 inches at the widest point. I used 3/4 in ply wood, just scraps I had.
And 12 in from the bottom
Now drill the holes in your top supports 1 inch in on each side. They should be 12 inches apart, just like the holes on the seat supports.
Turn the swinging bars on their side so the holes are on the right and left, not the top and bottom, and screw the foot rests on the bottom with 3 inch screws. 2 or 3 screws on each.
Bolt the swinging bars to the seat supports.
Then bolt the swing to the top supports and she is ready to go!
I think I might cut some dowel rods, drill another hole on each bar about 1 ft up from the seats and slide the dowels through. One screw in the center should hold them, then the kids would have some handle bars.
Seriously, they LOVE it. (it's bigger then the ones you can buy, so it swings higher)