If you have a wooble related with the bearings on the fork or your scooter have a significant gap between the fork and neck, you can use a plier to solve the problem, be carefull to do not tight it too much.
Also, you can use a modified Allen key 17 mm in order to do same procedure.
Have a look to this video:
https://drive.google.com/file/d/1CUEjDyKnQ2_DxdQXx9KJ9ltBBypVYunk/view?usp=sharing