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Caution:
The retaining nut may not be tightened when there is
no Chuck in the welding gun.
6. Loosen the retaining nut (if it is tight) by turning 90° with the
socket spanner.
7. Insert the Chuck to the stop in the plunger of the welding gun.
8. Then tighten the retaining nut firmly.
Caution: Make sure that the bellows is positioned correctly on
the retaining nut.