On page 16 & 17 shows the way to thread the Tiara in my instruction book
http://babylock.com/ftp/whitepapers/...ion_Manual.pdf
also you may need to adjust the tension more
Thread Nests Under Quilt Corrective Measure
• Check that the machine is threaded correctly. Make certain that the thread is
flossed snugly in place between the two tension discs. If the machine is correctly
threaded, tighten the top tension by rotating the tension knob clockwise.
• Not enough tension on top
thread
• Improper threading • Refer to the threading diagram and threading instructions on pages 16-17.