Hello i have the pin Pro Football from 1973 and once i get the ball to the 10 yard line where you are about to score i get the touchdown but it does not reset the ball back to the start so everything i hit i keep getting a touchdown since it will not reset to the start. I think i need to clean the part that effects if it resets but i am new to this so i would like to know what to do and what to use to clean said area if i need too. Thanks!