B-Tech System X BT8370-3X3-BB Installation Manual page 11

iii. Use item E1 to set the distance between items C1 on item B1 according to the screen size.
Once set, tighten item C3.
E1
C1
Leave at least
a 5mm gap at
top of column
for item B2.
ADJUSTMENT
KNOB
B1
C1
C1
11
E1