FOREDOM Handpiece H.20, Important Instructions

5mm (3/16

″

) distance from 

end of Collet to Lock Screw

Collet

Collet Lock Screw

Fig. 4

1. Un-screw and remove nose-cone and felt washer - Fig 1.

2.Open the collet completely, with lever 

perpendicular (at a 90° angle) to

the handpiece - Fig. 1.

3. Insert a 1.5mm Allen wrench (supplied with new handpiece

collet) into the collet lock screw, and grip the exposed spindle

using soft-jaw pliers. Turn the Allen wrench counter-clockwise

1/4 turn to loosen the collet lock screw - Fig. 2.

4. For collet adjustment procedure, proceed to Step 7. To 

replace the collet, or to remove it for cleaning, un-thread 

the collet completely by turning it counter-clockwise - Fig. 3.

Lever

Soft Jaw Pliers

Spindle

Spindle

1.5mm Allen Wrench

1.5mm
Allen
Wrench

Loosen

Tighten

Tighten

NO Slip

Bur

Collet

Collet

Collet

Collet Lock Screw

Felt Washer

Fig. 1

Fig. 2

Fig. 5

Fig. 3

Fig. 6

Nose-Cone

5. When re-installing a collet or installing a new collet, the 

collet lock screw must be in the collet before you screw the 

collet into the spindle - Fig. 5. The collet lock screw must be 

threaded into the collet to a depth of approximately 5mm, 

(3/16

″

) from the back-end of the collet - Fig. 4.

6. Check to insure that the collet release lever is in the fully 

opened position - Fig. 1. Screw the collet into the spindle 

while gripping the exposed spindle with your fingers. Do not 

screw the collet in too far. (Do not close the three slots in 

the collet.)

7.

Collet Adjustment Procedure:

Insert a bur with a 2.35mm shank into the collet. If the bur 

does not enter the collet, un-screw the collet counter-clock

wise until the bur fits in freely, and re-insert the bur. The 

collet tension is adjusted by rotating the collet clockwise to 

tighten, and counter-clock-wise to loosen - Fig. 6. The collet 

is adjusted properly when a SLIGHT resistance is felt when 

moving the bur in and out with the collet release lever in 

the fully opened position. Next, grip the spindle with the 

soft-jaw pliers, and tighten the collet lock screw securely 

with the Allen Wrench - Fig. 2.

8. Insert a 2.35mm shank bur into the collet, and close the 

collet release lever. Using a cloth to protect your fingers, try 

to pull the bur out to test the collet’s holding strength - Fig. 7. 

If you can remove the bur by hand, the collet is too loose. If 

the collet is too loose, loosen the collet lock screw, refer to 

Collet Adjustment Procedure 

above and re-adjust the collet 

until the bur cannot be removed with the collet closed. 

9. Re-install the felt washer, and the nose-cone. 

Loosen

Fig. 7

H.20 Handpiece Collet 

(

P/N HP3-1008

)

Replacement and Adjustment