You must prepare (at Top) to roll your flat left wrist, on the line. With a strong left hand grip flat means "geometrically flat" rather than literally flat. Hit the search function for clarification if you need to. Once achieved Lynn said we "will go immediately to the next level".
There is no other way to get there perhaps. So trade a bending left wrist for a flat rolling, on line, one. Grab some dowels and try it out.
The bending left hand can often be fixed with a better understanding of the on line uncocking of the left hand I find. The plane of the left wrist cock and uncock again. It all relates.
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