finger trouble
n.β Β«It was an assembly error in the carβs in-line six that led to a blow-up and fire as one of the conrods left the scene of the crime through the side of the engine block. Race teams put such failures down to “finger trouble,” since they are often due to mechanics doing something wrong with their hands.Β» ββPointing the finger” Sunday Times (Perth, Australia) Jan. 21, 2007. (source: Double-Tongued Dictionary)