Building a seesaw with sliding seats
Step 5. Attach the beam to the Stand
Drill a 1/2" (12mm) hole through the uprights [a], 2-1/2" (64mm) down from the top.
Cover the holes with a galvanized tie plate each side and drill through them.
Align the holes in the beam [d] with the holes in the uprights [a] and commence to thread the bolt.
Apply washers in the following order as the bolt is being inserted:
Washer, upright [a], washer, beam [d], washer, upright [a], washer, nut.