NSK PRESTO II Mode D'emploi page 6

5. Operational Procedures of Handpiece
1) As the chuck of the PRESTO handpiece is a push-in type, set the FG burs of ø1.6mm and push in as shown in Fig.7
Push in the bur of which the end is tapered by using the designated bur-inserting wrench as shown in Fig.8.
2) When removing the bur, it can be removed by turning the chuck release ring in the direction of the arrow in Fig.9.
6. Replacement Procedures of Cartridge
1) Fit the cartridge wrench supplied with the handpiece to the
flats of the handpiece nose. Turn the cartridge wrench as
shown in (Fig.10) after it is loosened, turn the nose by
fingers and remove from the handpiece.
2) Before inserting a new cartridge, clean the head interior.
3) Finally, securely tighten the cartridge by turning it in the
reverse direction to removal.
7. Replacement or Cleaning Procedures of Chuc
7-1 Removal of Chuck
1) Remove the cartridge with a bur or dummy bur as it is
installed. (6.Replacement Procedures of Cartridge)
2) Hold the rotor with two fingers as shown on the Fig.11.
Mount the wrench provided on the rotor nut located on
the top of rotor shaft and turn counterclockwise.
(Either side of wrench can be used.)
Fig. 7
Chuck Release Ring
5
Fig. 8
Fig. 9
Fig.10
Fig.11