How do you make a kick scooter solid?

You will be needing a shifter and two Allen keys.

The shifter must fit your headset. (below the clamp & above the front tire)

And 5mm Allen Keys.

I would suggest a quad clam (makes your bars tighter & stops rattles)

#1 Tighten your clamp to the max.

#2 Make sure you have a spacer between your bearings (in the wheels).. (makes wheels solid and does not rattle)

#3 Tighten your wheels to an adjustable tighten (enough see the wheel does not jiggle) Tightening the wheel too much will make your scooter impossible to move.

More parts i suggest is a one piece and metalcores. Your scooter will be solid in no time.

Pick your scooter up and drop it on it's wheels and see if it's bouncy and sounds solid.

:)