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 A double stepped screw play elimination unit, which eliminates the side tilts of the sitting unit's frame, was applied here.
An additional element applied between the blocking sleeves
is a welded sleeve, which leads the screw along with the bronze gliding rings.
The task of the cast iron nuts situated on the screw
is to decrease the friction.
The application of a Ø 20 screw with a pitch of 5 mm makes a
fast raising of the sitting unit possible.
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