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When mounting more than one BL1 you need to consider the fixation:
The reason why it is important only to fix one column, is that the columns will not move exactly in parallel – even if you have positioning such as hall.
If more than one column is fixed it can lead to dangerous situations.
If you have a trend/anti-trend function in your application, you need to mount one or more BL1s with a slider.
Having sliders prevents the column from bending as illustrated below.
Fixed pivot point
Moveable pivot point
Fixed pivot point
Fixed pivot point
Example 1.
Example 2.