The tilt of the blade is adjustable and controlled by twisting the handle. This enables the operator to change the tilt of the blade (continuously if required) to achieve the optimum finish to the concrete.
If the blade lies flat on the slab it leaves a rough finish but will close and fill holes. When the blade is tilted on an angle a smoother finish will result.
There is no need to raise or lower the handle, simply twist it for best results. Kraft Bullfloats sold without Knuckle, see page 8.