Our friend Georgi Mirov has made these collet type spinners and blade sets for high power F5B applications. The Spinner is 38mm to fit our Surprises, Enigma and many other models.
This set has a 7 degree twist that gives you a 17x21!
Also available with a 5 degree twist to give you a 17x19.5!
Max 4500 W
There is no short cuts on these sets, as they are the "real deal".