Anonymous posted an answer for this Brother XL-5500 Mechanical Sewing Machine:
"Your bobbin is probably too loose. When you set a new bobbin, stop every now and then and..."
Anonymous posted an answer for this Brother XL-5500 Mechanical Sewing Machine:
"Next to the "selection wheel" there's a large-ish "hole" with a screw at the bottom, use..."
Sewing Machines 2 answers