Lukas DUO Traversing System - Manual (Page 18)

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6.1.7 Setting up the traverse jack with anchor jack
Fit the traverse jack with the head of the anchor plate in one of the matching mounting
points in the rerailing bridge. For this purpose you will have to pull the slide plate on the back
end of the traverse jack up a little. Then attach the piston head of the traverse jack in the
centre retainer on the roller carriage (see illustration below). You may have to move the roller
carriage a little in order to attach the jack head.