hopetoquilt

I am Losing My Mind due to tension issues with my machine. I have a baby lock quilters choice. It is about 10 years old. I have changed the needle, changed the type of needle, changed the thread and type of thread, use different fabrics, sewn through 2 pieces of fabric and through a quilt sandwich (fabric and batting (using 1/4 inch foot and walking foot as appropriate), always use same thread in bobbin and machine, retread machine and I even screamed at the machine. I keep getting very loose on the back or a nest or thread breaks. I increased tension on the electronic part of the machine and that helps sometimes briefly but is Not the solution.

I am am out of ideas. The only thing I am holding off doing and maybe should is taking a screwdriver to the bobbin case. I was told that is a last resort or not to do it.

can anyone help me? I am so frustrated!!! Thanks. Jocelyn.