I'm using my new to me featherweight that my dh bought for me for Christmas.
My squares are puckering. Not allot, but enough that I have to slightly tug at them to straighten them out. And still they don't lie flat.
I've adjusted both the bobbin tension (I've had problems with the tension and all of you were so wonderful with your suggestions.) and the needle tension.
I've read the manual, checked online and still my tension is close, but not quite right.