BRASSELER USA BRiO450 Mode D'emploi page 8

Installation
Press
1. Press push-button and insert bur into head until it stops.
Install
2. Release pressure on button; bur should now be secure.
3. Firmly tug on bur to ensure that it is properly secured.
Remove
Removal
1. Press push-button on end cap with thumb.
Fig. 5
2. Pull to remove bur.