Repairing a Casablanca fan that is scraping
	
	
		I have a Casablanca 3 speed fan that is controlled by a wall mounted push button control. Whenever the fan is running, it makes a metallic scraping sound. I tightened everything I could find to tighten, but the problem is still there. 
I thought about replacing the fan with a different brand, but was told that is I did that, I would have to also replace the wall mounted control.
I would rather repair the fan. Any suggestions would be appreciated.
Thank you