Linak TWINDRIVE TD1 ユーザーズマニュアル

Before mounting, both mounting brackets must be pulled out to their outer position by pushing them back. 
This gives freedom of movement to the bed bracket.
Mounting is done by pushing the bed bracket into the TD1 unit and thereafter pushing the mounting brackets back again. 
IMPORTANT one must be completely sure that the mounting brackets are in place before TD1 is used.
If the TD1 unit is mounted in the bed it will not be able to fall out if it is under load because the spindle nut is designed to 
hold it in place.