[O.B.Left]

Yes, O.B., that one has bothered me ever since I first ran across it.
I didn't want to bother Yoda with a PM on it. Unclear on the concept.
What's the difference between that and Tomasello's right arm throw?

Perhaps Yoda will jump in here to straighten things out. Perhaps not. I highly recommend you give the Non Auto Left Wrist Throw a try though. Here's a video that might help with its Alingment to Plane . This could be Auto or Non Auto but I love the DTL point of view and that little Throw .... Great drill , maybe the best drill to my mind anyways.