Adjust the bobbin how? Tension???
Bobbin Tension How and Why Tension is Adjusted
Lots of web sites re bobbin tension
SOURCE: bobbin case futura singer sewing machine came out
The opening fits on the right side, toward back. There is the silver ring with the slot in it for the bobbin. That slot is facing the sewer.
SOURCE: singer futura model 900 sewing machine
Recently had same problem. Underneath the bobbin area on the bottom of the machine is a small white plastic piece that resembles a fan. Singer calls this the bobbin cam actuator. It is usually cracked along the sleeve that fits over the metal pin, bar? This is the mechanism that lifts the bobbin when it is wound. When its broken it can't lift the bobbin to be wound properly.
SOURCE: Singer Futura 900
Here is a FREE manual for the Singer Futura 900
http://www.singerco.com/uploads/download/a519b77b90074797a4f001327810f68ccb64f3d1.pdf
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