Husqvarna VIKING Designer RUBY 90 User Manual page 43

3. Pull the threads between the thread tension discs (E).
Make sure that you place one thread to the left and one
to the right side of the tension discs.
Thread down through the right threading slot and then
upwards through the left threading slot. Bring the threads
from the right into the take-up lever (F) until they click
into place (G), and down in the left threading slot. One
thread should be placed inside the needle thread guide
(H) and the other one outside. Make sure the threads do
not become twisted together.
4. Thread the twin needle manually.
Do not use the automatic needle threader for twin needle!
Note: The weight and irregular surface of specialty threads such as
metallic increases the amount of friction on the thread. By reducing
the tension, the risk of needle breakage and thread breakage is
reduced.
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