Some people will gasp when they read this, but I read recently about using very thin straight pins in piecing and sewing right over them. I always did this for years with my old trusty White Rotary sewing machine and then with my Singers. I have a very expensive Bernina and I was told to never ever do this. But when I read about it, I decided to buy some very thin pins and try it. I am very careful and it works for me.