My first questions when sewing thick fabrics would be "Are you using universal 90/14 or a "denim" needle of size 16 or 18 needle?; Are you using an elongated| SewGuide
How to deal with bent and shattered needles and how to prevent this from happening for safety sake and for smooth sewing experience.| SewGuide
If your sewing machine hardware parts like bulb, tension dial, handwheel etc are not working properly, checkout the solutions here.| SewGuide