I have a a rite adjustable tension bobbin with a a long, 7.5 cm. tube which is also very small in diameter. My question: my bobbin threader, the red bead head type, will not go into the tube because the of the narrow ceramic? tube. How do I thread the bobbin? Ive tried the old tried and true "sucking the thread down the tube", didn't work? Any suggestions?

Northwoods