"Going well into the build but got to bag no. 4 lo and behold missing small black gear that goes on engine ! Had to open bag 9 and use a gear out of that while waiting for lego to send me missing gear. This is getting a bit tedious LEGO after having 3 missing parts in the very last bag of parts building the liebherr excavator. I empty bags into cat litter trays with deep sides for building so parts have not gone astray. I suggest you look further into your quality control because something is not right !! The money these cost too this should not be happening, once fair enough but twice is unacceptable."