I have inherited 2 vintage machines, one a Singer 15k and the other Singer 44 crone / adaptation by "Typical" of china, during their faithful service to my grandmother and mother in their lifetimes, they have never needed any repair by anyone. My zigzag machine made in the 70s by Toyota have a sturdiness that is only comparable by contemporary machines of that time, regardless of brand, it is all metal (alluminium), but still cannot compare to the toughness of the chassis of the old Singer, also the Singer's internal mechanism is much simpler (no gears), and naturally less liable for problems.