Let me give you one more tip about double stops. We spend so much time learning NOT to play two strings and then, we are required to PLAY two strings. Maddening, hunh? So now that you play two strings with the bow, naturally instinct tells you that if two fingers are used together on these two strings, we must set them at the same time. So not true. Be sly and try setting them in a ‘rolling’ movement that allows you to set one finger first, then the other. By setting one finger first, it provides a guide and an anchor that makes it more likely that you’ll place the next finger on the other string more accurately. I hope this helps!