Thank you all,
sorry it took me a while to get back to you.
I purchased the truffle shuffle and manfred shuffles from Dan and Dave. They look deceptive and worth the practice,
especially the TS as it seems less angle sensitive.
I like that it looks very much like an in the hands RS, bridging and springing the cards at the end.
Barry,
thanks for the reference to Tarbell. I should have known better and checked there first

Reading through the description though,
I'm not sure how the two halves are brought together after the riffled corners are separated. Is it a case of mimicking the action
of the two halves being pushed together?
One more thing for all- Michael Vincent, in "The Classic Magic of MV" demonstrate an in the hand false riffle shuffle, which looks amazing. Unfortunately he doesn't go into the explanation and refers to Guy Hollingworth's "Drawing Room Deception".
Does anyone us that shuffle? It looks like the Holy Grail!

))
Take care,
LP.