Singer is known for their durable and reliable sewing machines. The Singer model 6235 is a sewing machine that was produced in the 1980s and is popular with sewing enthusiasts and Singer sewing machine collectors. It can be found in both estate sales and in consignment shops. The Singer 6235 has a drop-in bobbin style, with the bobbin directly beneath the needle under the sliding metal plate, which makes it very easy to change.
Turn the sewing machine off. Raise the presser foot. Raise the needle to its highest position by turning the handwheel counter-clockwise.
Slide the metal plate, located under the needle, back to open up the bobbin case area. If there is an old or empty bobbin, remove it by lifting it straight up.
Grasp the bobbin and hold it with the rings side up. Pull about 4 inches of thread from the bobbin. Drop the bobbin, still with the rings side up, into the hole in the bobbin case.
Guide the end of the thread through the notch on the left side of the bobbin case and bring it to the right, past the number two point as indicated on the bobbin case. Leave the slide plate open. Hold on to the end of the thread with your left hand and turn the handwheel toward you with your right hand to lower the needle and bring up the bobbin thread. Once both threads are up, pull about 4 inches of thread together toward the back of the machine, then slide the bobbin cover plate closed.
Keep the sliding plate open during bobbin insertion and when raising the bobbin thread to avoid thread jams. Ensure the bobbin is dropped in with the rings side up. If you are unsure, touch both sides. The bottom side will be smooth, the top side with have rings.