Installing The Height Adjust Button
The allen keys/screw driver required for this instruction guide were provided with your original purchase along with the instruction manual.
Other Allen Keys/screwdriver of the correct size will also work.
You will also need a pair of long pliers or something similar to remove the height adjust button from the handlebars.

Open the collar clasp on your scooter.

Loosen but do not remove the large screw on the collar clasp using the largest allen key provided with your original purchase.

Then remove the small screw on the collar clasp using the screwdriver provided.
Once removed put to one side.

Lift up the collar clasp.

Push in the height adjust button and then pull the T-bar out from the handlebar stem.
Put the collar clasp to one side.

If the button is jammed inside the scooter you will be able to locate the button inside of the top T-bar.
Using long pliers or something similar push the button back into place.

If the button has come out of place and is not located inside the T-bar, remove the height adjust button spring using long pliers.
Once removed you can then put into place your new button.
Make sure that the button is on the same side as the hole on the T-bar and that the curved side of the spring goes in first. Push the button into the T-bar until it pops out into place.

Put the collar clasp onto the T-bar and then place the T-bar back into the handlebar stem.
The side of the collar clasp that the small screw goes through is placed on the side with the small recess in the handlebar stem (opposite side to the height adjust button).
When closed the front of the clasp should be on the front of the handlebar stem.

Screw back in the small screw on the collar clasp.

Tighten the larger screw on the collar clasp to secure this into place and then finally shut the clasp to provide extra tension.
This should be firm to close to prevent any movement on this joint.