Ok, I have a question. I do have some 15 clones and then I have two other machines. They are made in Japan and take class 66 bobbins, not the class 15 bobbins like the 15 clones. So I'm wondering if I call them 15 clones or 66 clones? The reason I ask is that their threading is more lke the 66 than the a Singer 15 with the thread tension being not on the side plate but facing the operator. I'm more curious than anything else and feel free to weigh in. Hopefully, I have attached a photo of one of them.