Tension knob for the spring arm.
I purchased a used unit with the tension knob missing. I purchased a new one, which has a spring and a washer with it. How do I install it?
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First, insert the spring into the hole in the knob. Then, place the washer between the machine and the knob before tightening the screw.
It is important that you do not tighten it too hard when you use it; it only requires a little.
Good luck!