NSK Ti-Max X450L Manuel D'opération page 7

5. Insertion & Removal of the Bur
5-1 To Insert the Bur
1) Insert the bur until it is fully seated. (Fig. 4)
2) Depress the Push Button and insert the bur into the chuck until it is secure then release the button.
3) Ensure that the bur is secure by gently pulling and pushing the bur WITHOUT depressing the Push
Button.
5-2 To Remove the Bur
Depress the Push Button firmly and remove the bur.
NOTICE
Gripping the handpiece while placing your thumb tip on the Push button will make it easier to press the button.
6
Fig. 4