Singer 306 Hook TMI

Actually not quite everything I wanted to say on the subject. TLDW, A 96-10 hook body is a drop in replacement for the OEM. A 20U shuttle will fit the 96-10 hook body and is cut for zig zag. Of course the 20U bobbin case fits the shuttle it was designed for. The final step is to either thin the tip of the locating finger or open the locating notch in the shuttle. This leaves you with an entire hook assembly built from current production parts that will work with standard 15x1 needles when the machine is adjusted to OEM specs.