Plying on my Drop Spindle

I made this short video to show how I ply yarn on my spindle. There is no sound, but that was better than the video game music that was there before.
I have my two singles posted in a box resting on an old spinning wheel. They are pointed downward so that gravity holds the needles in the box. When I'm not spinning, the spindle fits through the slats on the uprights for the wheel.
I ply the two singles together, and then check the twist. If it's over or under twisted, I correct before winding it up. Then there is less to set later.
My cardboard box lazy kate.