Seat sinks and/or rises on its own.
Stool rises to its highest point when there's no weight on it, and/or sinks to the bottom point when weight is on it. It will not hold its height adjustment.
the top of the cylinder there is a little green button that when
pressed releases the cylinder so it can be adjusted up and down. There
is a bolt in the underside of the seat in the adjustment mechanism that
is keeping the button pressed so it isn't locking into place. To remedy
this please follow the steps below.
1. Carefully remove
the cylinder from the underside of the seat. When assembled, the
cylinder is pressure fit into the adjustment control so it may take some
"elbow grease" to remove it from the top.
1.a. To do this,
flip the stool upside down and hold the stool off the ground by the
cylinder. With a rubber mallet (or a hammer but be sure to protect the
metal of the adjustment control) carefully tap around on the underside
of the seat. It may take a little time but the top will fall away from
2. Inside the center hole of the adjustment
mechanism where the cylinder had been there is a 10mm bolt. With a 10mm
socket, turn the bolt CLOCKWISE (half a turn at first) to drive the bolt
further into the underside of the seat. This bolt should be out far
enough to press the green button when you use the lever to adjust the
height, but not so far out that it continually pushes in the green
button without using the adjustment lever.
3. Put the cylinder back into the underside of the seat. Test and repeat if necessary.
Please feel free to contact us if the problem persists after troubleshooting.