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Chapter 3 Preparation and inspection before observation
3 While pressing the hook straight against the spring shaft, slowly
turn the hook clockwise to screw it onto the spring shaft. The gap
between the hook and butting position is 0 to 0.2 mm.
CAUTION
• Screw the hook all the way in. It may be a little stiff because there are no threads cut in the
thread hole.
• If it is not possible to screw the hook onto the spring shaft, or if the hook easily detaches from
the spring shaft, the service life of the spring shaft has expired. In this case, use a new hook
assembly.
Slits
0 to 0.2 mm
Spring shaft distal end
Hook butting position
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