Step 9:

Flip the swinging seesaw frame over so that the ends of the bolts are pointing upwards.

Add a washer and nut to each bolt.
Finger-tighten the nuts just enough so that the handle and footrest section can still easily pivot.
Then add a second nut to each bolt. Tighten each second nut against the first. This locks the nuts together and prevents any nut
from vibrating off with movement.
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