Hi there... I have become custodian of a Carrera Evolution 25312 set, which my kids have fallen in love with. Unf one of the cars has a broken wire connector to the brush unit. I can't see any advice/links on how replace these as they seen to be an older type, can anyone advise or point me at some guidance? Thanks in advance! I have put some photos on this link as well as those uploaded. https://drive.google.com/drive/folders/1R4UuiwdTfpi5z08yQ0iDebLvZ89ITepy?usp=sharing