There are three known root causes for wobbly chair complaints, all of which can be resolved at home. In case you are experiencing this issue, please read the below to better understand what may be causing it.
When testing if your Tripp Trapp® is wobbly, there is a right way and a wrong way to test, so make sure that you test by using the correct method. Incorrect testing is one of the common red herrings of wobbly chairs.
Do not apply pressure on the edge of the legs to check if the chair will wobble. This will not give an accurate representation of potential wobbles, as when sufficient pressure is applied in a brief series of pulsating pushes, any non-wobbly chair will suddenly appear as wobbly.
To accurately assess the potential wobble of a chair, apply your flattened hand on the central surface of one of the plates and direct your hand from side to side while not removing it from the plate. If this still exhibits a wobble, then a wobble does exist and might be fixed by one of the following:
The Tripp Trapp® should always be assembled on a completely level surface. Ideally it should be assembled on a table top to guarantee a flat and stable surface. If the chair is assembled on a tiled floor or another type of surface which by design is not 100% level, it cannot be expected to rest completely level.
The Tripp Trapp® is a sturdy product, but will bend if sufficient pressure is applied. Tripp Trapp® Chair uses 10 screws to connect the legs to multiple parts in the middle and the floorbrace (bottom wooden part) is the first part which must be fully tightened, to create a stable base for the rest of the assembly. However, this bottom part, as the first one to be fully tightened, is often overtightened. Overtightening this piece can cause the chair to have a slight wobble. Fortunately releasing pressure on both screws that hold this piece by roughly 15-25% of a full turn should resolve any wobble.
The order of tightening the screws is important. Always move from tightening one set of screws before moving on to the next set, therefore moving up slowly in a zig-zag pattern. Never tighten one side fully before interacting with the other side - this could cause one of the legs to become warped.