I put a 15 tooth front sprocket on my banshee the other day and it rubs the metal piece in the front of the sprocket. It has a screw at bottom and looks like it can come off. So do I try to take it off and grinds it down a little bit??? It barely rubs so I don't need much room, but it still is not right. What is the application of putting a larger sprocket on because I know there is up to 17 tooth for it. Any input will help...