Version 1 bridge construction elements are converted into variably set-up stage wagons with corner castors. The corner rollers, like the corner mounts for the plug-in feet, are to be installed in the functional groove of the frame profile.
The corner castors have pivoting wheels (Ø100). The end faces can each be equipped with 2 corner rollers, the middle bars with either 2 or 4 corner rollers.