Drop-In Bobbin Tension: What You Can and Cannot Adjust
Top loading machines hide the bobbin tension under a clear plate on purpose. Here is what the design lets you change, what the factory intends, and where the real problem…
drop in bobbin
Needle Hitting the Bobbin Case: Find the Contact Point
A metallic tick under the plate is not random noise. It comes from one of six places where the needle can touch metal, and each one leaves its own clue…