That bar doesn't hit the hopper. It is just set to be off balance from the starter, so it vibrates from not being correct, which shakes the hopper, which knocks the salt into the hole hopefully. You can also buy a vibrator specifically made for these applications. Some of the online suppliers are selling them, and your local dealers should be able to get them as well. You can also do a google search to find other companies selling vibrators that will work for these spreaders.