The high hexagonal nut can be recognised by its height being 1.5 times the thread diameter. Evenly tighten the two U-bolt nuts alternately.
2.
Evenly tighten the two U-bolt nuts alternately.
3.
The yellow zinc-plated hexagonal nut can be recognised by its height being 1 times the thread diameter. Evenly tighten the two U-bolt nuts alternately.