Every time you build a printer you end up testing your steppers to make sure they work like the previous set. Sticking a piece of tape to the stepper is fine. If you, like me, choose to rather reuse the tape, you might find this useful. It fits perfectly and is zero effort to pop onto a stepper motor and take them off again.
The stepper "Tape" fits a 5mm shaft perfectly.
Hope it helps you. It is too small to still be typing more :)