There are three points on the saddle and if one of them is off or in this case no tension, the weight distribution will not be balanced and can lead to breaking the hardware on the frame of the saddle, or most commonly the nose pin. To tension the saddle, turn the spanner clockwise with the saddle facing you from the nose, as you turn the nut it pulls and stretches the leather out. Overtightening can cause too much tension and shortest he life of your saddle. In extreme cases, it can also pull the leather off of your rivets. Use short turns and check regularly to achieve the desired tension. If the nose pin turns when as you turn the bolt, you would need pilers to hold the pin when you turn it. Special note: Do not tension a wet saddle.