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Make sure the support angle are 50mm x 50mm
Measure the curtain slat width without nylon end caps and add 40mm to obtain the overall back of angle width
Fit the left hand support angle into position using appropriate fixings. And continue for the right hand support angle in the same manner.
Move the barrel into position and fix the left hand side into place with nuts and bolts.
secure the other side of the barrel ensuring it is perfectly horizontal with the aid of a spirit level.
fix the key unit to the wall and connect the motor wire
connect the key unit to a suitable power supply
insert the key into the unit and turn in the down/close direction to rotate the barrel as far as it will go