Depends on the motor you have.
Normally the output shaft of your motor will have a certain diameter (2mm,
2.3mm, 3mm, 3.17mm, 4mm and so on), and you buy a prop saver corresponding
to that diameter.
Look for something like this:
If your motor has a spinner, you need to remove it.
The first link looks like what you want for the Slow Stick. I think you are
going to have to lose the spinner since it grips the prop shaft. You might
be able to thread the nuts that hold the prop saver in far enough that the
prop shaft sticks out some but that would probably reduce the
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