The bassoon is held diagonally in front of the player, but unlike the flute, oboe and clarinet, it cannot be easily supported by the player's hands alone. Some means of additional support is usually required; the most common ones are a seat strap attached to the base of the boot joint, which is laid across the chair seat prior to sitting down, or a neck strap or shoulder harness attached to the top of the boot joint. Occasionally a spike similar to those used for the cello or the bass clarinet is attached to the bottom of the boot joint and rests on the floor. It is possible to play while standing up if the player uses a neck strap or similar harness, or if the seat strap is tied to the belt. Sometimes a device called a "balance hanger" is used when playing in a standing position. This is installed between the instrument and the neck strap, and shifts the point of support closer to the center of gravity, adjusting the distribution of weight between the two hands.