The ST Hackamore applies mostly nose pressure through the rubber covered noseband, with virtually no poll pressure due to the noseband not being fixed.

The position of the noseband can be adjusted by moving the stopper below the noseband.  The curb pressure, while there, is fairly light and the backstrap can be adjusted to regulate how fast the action on the nose comes into effect.

Care must be taken to set the noseband so that it sits on the bony part of the nose, and not on the soft cartilage.