You simply cannot go without the Pre-Wound Bobbin Centre Pin. Install with ease. Better yet, it will increase your productivity from the get-go.
The adapter was specifically engineered for top-loading sewing machines. Thus, it will give you a much better thread flow.
The Bobbin Center Pin Spacer comes with a special coating on the bottom for smooth operation.
For better stability and the correct height for pre-wound bobbins in the bobbin case, use the Bobbin Center Pin Spacer.