It sounds like you're running into a classic issue with vintage Singer bobbin winders. When the winder tire tightens and stops the mechanism, it's often due to either the rubber tire being too stiff or worn out, or the alignment between the winder and the balance wheel being slightly off. You might want to inspect the tire for cracks or hardness—replacing it with a new one can sometimes solve the problem entirely.
Also, since the Singer 128 uses a vibrating shuttle and a different bobbin setup than modern machines, getting familiar with proper bobbin placement and tension can really help avoid winding and stitching issues. Here's a helpful guide on
how to put a bobbin in a sewing machine that walks through the basics and gives some extra tips for older models like yours.
Hope that helps! Let us know if adjusting the tire or checking the shuttle mechanism changes anything.