If after assembly one of the plates is loose and slides easily, it may be due to the following:
- There are less than 3 open grooves between the two plates
- The screws have not been tightened enough
- There are dimension differences between the two plates
Most commonly, the guideline of keeping 3 open grooves between the two plates is ignored, despite the User Guide's recommendation for the initial setup. It is important to understand that the plates are the only parts within the chair which are not screwed to the legs and rely solely on the surrounding components being tightened sufficiently to hold the plates securely in position. Therefore, the closer the plates are to the respective pieces that hold them in place, the more stable they are. However, if the plates are too close to each while also being positioned too far away from a screwed in component, the effects of the pressure from the surrounding tightened components becomes weaker and can no longer prevent one of the plates from sliding.
With sufficient pressure from tightening the upper metal bar, it may be possible to even have the seat plate in the first groove and the foot plate in the fourth groove without either plate sliding, though this is not recommended.
The Tripp Trapp® is meant to be used so that the child is able to have their feet touch the foot plate, however, this may not always be the case when the child is 6 months old. The rationale behind having the feet touch the foot plate is that the foot plate allows for a secure footing for the child once the feet and legs are load-bearing, whereas 6-month olds are not ready to stand up independently and do not need to touch the foot plate during those first few months while being seated.
In case there are dimension differences between the plates or it is not possible to have the screws tightened any further due to issues with the metal threads of the screws or metal bars, it is advised to document this by taking images or videos and approach the Stokke® team using the Warranty & Claims form.