I don't have a 201 but I do have a 66 and a 15-91. The 15-91 has handled different weights without much complaint. The only thread that needed some upper tension adjustment was the upholstery thread. Not so with the 66, anything that's a thicker than regular sewing thread affects both the upper and lower tensions. It's easier to switch to the 15-91 than mess around with the tensions.