W&H Perfecta 900 Instructions For Use Manual page 14

Knee control unit assembly
14

Mark the screw holes with the enclosed drilling template or
holding plate .

Pre-drill 4 screw holes with ø 3 mm .
Note dimensions:
H = 550 to 600 mm
H1 = at least 90 mm
D = 90 mm (control unit with external coolant supplying)
125 mm (control unit with internal coolant supplying)
measured from the front edge of the bench
L = 100 mm
A = 40 mm