ATN PS-40 Operator's Manual page 36

To install the Extender Focus Knob (Figure 2-19):
1. Unscrew the fixing screw. replace it to short fixing screw [1]
from extender Focus Knob Kit. Screw the new fixing screw [1]
to the lug and tighten it. Do not over tight it avoiding irregular
rotation of the focus ring.
2. Place knob [2] on top of focus ring knob, insuring it is properly
seated.
3. Tighten Extender Focus Knob screw [3] until it is secure (do
not over tighten).
To remove the Extender Focus Knob:
1. Unscrew Extender Focus Knob screw located on top of knob.
2. Remove Extender Focus Knob.
2-20