How do I correct the forearm Locking Lever from slightly coming open on my Top Single Bbl, The O/U Bbl has no problem. It has a sharp edge on it and it is Biting my Left Hand Palm. I am thinking I need to tap the Bbl Forearm Locking lug on the Bbl, or do I relieve it with a stroke of Small Flat file. It happens everytime I fire it, Only on the Top Bbl, I have to push it back up. Gary Bryant Dr.longshot