When knitting with two strands together I find that my two balls of yarn can get out of control. The yarn gets tangled and flies all over the room.
Carefully place both skeins on the winder one on top of the other and pull both ends at the same time. They do not get tangled while winding the ball and it makes knitting a lot cleaner. Maybe you already knew this, but I thought it was a great idea and wanted to share it with you.
I hope you have a wonderful relaxing weekend, knitting.