V20 ebike's front fork is loose, How to tight it?

there is some necessary spacer rings in the connection place. if missing please contact seller.

[@Sanesaint1]

Thanks

[@Sanesaint1]

Perfect mine is a little loose

[@ziggyrid]

Where can I buy a new double suspension fork for the tamobyke

[@Brue58]

The bottom of mine are getting loose,i guess i need to buy new ones