That happened to me recently - had the tension just right then had to change bobbins UGH what a mess! Had to rip out and adjust all over again. Learned the hard way to do a test after each bobbin change.
Originally Posted by
ka9sdn
The key here is the tension. Try it out on a sandwich piece and see what it looks like to you. You are the final judge. I use two colors often but do keep an eye on that tension--sometimes just changing a bobbin makes a difference as they all seem to wind a little differntly.