Hi all! At times, my '76 Surfer incorrectly awards a match credit when the the match digit is off by 1 position. For example, it may give a match when the final score ends in '10' but the match value displayed is '00'. I pulled the match unit out of the back box and noticed there's some play on the rotating arm which determines the match value (A on photo). It appears to me the arm is held in place by pressure from the clip (B). I've tightened the mounting screws (C) but that's not helped. Any ideas? Thank you!!!