May not be a "trade secret", but sure is a neat trick !Have another Rod with a heavy duty Spro ball bearing snap swivel that will fit thru all the guides and put a 6/0 on it.
Only fill the 6/0 three quarters of the way.
If the Tarpon is stripping you on your casting reel, tie a surgeons knot into the line and after you clip the surgeons knot loop with the snap swivel and fight the fish on the 6/0.
Redheaded fella was known for stuff like that.
Thanks ... I like it !