Smart 450 dust cuff (spur bar head) – left front ineffective

Hello everybody, I bought myself a small Smart as a second car. However, the TÜV has found a few small defects, actually nothing dramatic. However, a lack of it, as already described in the title, is „dust cuff – front left ineffective. I honestly have no idea what I have to change here now, possibly the carrying joint of the track rod head? On the Internet I find somehow no cuff for the track rod head. Or is here spoken of the cuff of the track rod? If yes, then why is track rod head in the report? Would really be very grateful if someone could help me further here. Thanks in advance. MfG Daniel