I'm hearing about tension. My machine, Viking Designer 1 is supposed to set automatically. I just had it serviced and I'm still having trouble with uneven stitches, skipped stitches. I use the right thread, the right needle and still problems. Someone suggested that I buy better thread. What do you all think? I would appreciate any info. I've been sewing all my life on a Singer. I think this is the temperamental machine and not the old ones.