Wobbly driver's seat

[Traktor]

Hi,
Does anybody know if the seat mechanisms can be serviced?

Mine has a small wobble (few millimeters).

Every time I accelerate it tilts backwards and every time I break it tilts forwards. It's not a problem on the motorway, but it's annoying as hell in town.

The mechanic where I service it says there's nothing he can do about it and it's a lost cause, but I thought I'd ask somewhere else.

Thanks.