Singer The SINGER 160 Instruction Manual 5 - Page 12

ADJUSTING THREAD TENSIONS Thread tensions will vary.according to the type and thickness of both thread and fabric. Adjust the thread tension of the machine accordingly while checking the seam. Thread tension:Turn dial toward smaller numbers, tension becomes loose. Turn dial toward larger numbers, tension becomes tight. A:Left needle thread tension dial B:Right needle thread tension dial C:Upper looper thread tension dial D:Lower looper thread tension dial Correct thread tension Right needle thread Back side Left needle thread 6mm(0.24") Lower looper thread Upper looper thread - n-