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Pages remade, dressed-down soundly and are in progress with renewal 23rd February 2018 - be warned that not all has been checked
Tension is one of the biggest bugbears of sewists. Too many of you were warned never to adjust the tension, but this is like buying a Mercedes and driving everywhere in second gear. My automatic instinct, to adjust and check every time I change the thread, the bobbin, or the fabric, makes my life much easier, and I almost never unpick..
Learn to love your tension units, and your sewing will improve no end...
I tend to set all my machines with light tensions on top and bottom threads - this makes working easier, reduces puckering, and means that the threads are under less strain.
The numbers on the dials are usually adjustable, by the way, and serve only to indicate direction - big number = tighter tension, of course...