Resisted shoulder external rotation in standing - version 2

Stand upright with your good side nearest a secured resistance band tied at waist height.
Place a rolled up towel between your elbow and body.
Hold the other end in the hand of your affected shoulder with your elbow at a 90 degree angle.
Slowly turn your arm outward pulling the resistance band.
Do not allow your shoulder to shrug.
Relax and repeat.