M3 Locking knob for Ball Vice

For some reason the original parts I printed were too small for my local hardware, maybe metric fasteners have different spec's all over the globe? These parts work with M3 nuts and bolts that are 5.5mm across the flats. For my indexing plate I used a M3 x 40 hex bolt and added a slight taper to the end of the threads (putting the bolt in a drill and rubbing the end against some abrasive paper). Print these parts as per the original design. Print all other parts as per original.