bert boesten

Thanks Tor. I think I'm on top of this problem now. I sized up the needle one step (to 25) as well. The thread I'm using is black and thinking of it, it may be old as well. When I get round to it I must buy some other colour. But for the moment I'm quite happy now.

Well, I'm making some progress, but also have some more questions. Reading some other topics on this forum I saw that the thread should go around the lower tensioner twice. That made sense to me because the lower tensioner consists of a wheel sandwiched between two felt discs. The thread just slides over this wheel and the tensioner is not working at all. Going around a second time with the thread may improve the grip on the lower tensioner and I may slacken the top tensioner. Which may solve the problem of the unwinding thread. So far the theory In practice I had to go around the lower tensioner wheel twice more ( that makes 2 and 3/4 turn) to stop the thread from sliding over the wheel. But as soon as I increase the tension, it starts sliding again. And to get a proper stitch, I still need a lot of tension on the top tensioner. So I figure the bottom tensioner is not doing its job, but all my 45K's are like this (last week I bought a third one, a 45K58). A different type of thread (or yarn?) probably will solve the problem, but still I would like to see the bottom tensioner doing what it is supposed to do.

I own an Adler 4-2 and a Singer 45K25 which both pose the same problem. I use Serafil #10 yarn and after sewing a little distance the yarn is twisting open and gets stuck in the needle hole. I find it gets twisted between the tension discs. In the Singer manual it states I should use left handed yarn. So is there anyone who experienced the same problem and how can I solve it. Where can I for instance order the right yarn and will that solve the problem?