Handling is a following: In normal use the saw is placed in 90 degrees. As soon as a corner profile has to be sawn the whole saw can be placed in the corner. The saw is then tightened in this position but the big knob at the front. Clamping of the wooden profiles can be done by sliding the profile under the aluminium bar and then tighten it with the 3 smaller knobs. A nice safety feature might be to integrate an extra on/off switch is on the clamping bar. So both buttons have to be pushed.