The problem about not gluing the winding in place before hand is that a winding of only 3 turns is almost impossible to keep in place on the toroid without some sort of glue... yes "CA" is crazy glue for those non-RC airplane flyers (grin).. Nothing wrong with using it for RF app's... been doing so for many years
How exactly do you "change the number of windings" once T1 is soldered in place?? You can only remove a winding, not add.
I have plenty 0f T-50-2 toroids so If I screw it up, I can easily try again...
