Shaft-LockThe standard Manhasset shaft is designed to hold 10 to 12 lbs. However, for applications requiring greater weight carrying capacity, our Shaft-Lock fits the bill. It is easily retrofitted onto all Manhasset music stand shafts, instantly allowing you to have your stand (shaft) support up to 75 lbs. With its fingertip twist mechanism, you can quickly adjust and lock the height at any position. In the unlocked position, the music stand is allowed to function in the normal fashion.