Phil,
I have had real spinners on two cars, and here is my experience.
- Only use a lead hammer, if you use a weighted rubber mallet, be prepared for your spinners to come loose
- use an anit sieze compound on the thread and spinner contact surface before fitting
- Strike the spinners solidly on altenating 'ears' until they stop moving, don't continue to bash away, they will fatigue and break
- Go for a short drive, and give them another whack to ensure they are tight
- Always wire your spinners on, to avoid that embarrasing feeling of being passed by your own wheel
That has worked for me for years.
Cameron