My brother bought a s&w m&p 2.0. When he treid to get the plastic plate off the top to mount the red dot he stripped the allen head. He got it out but when he put the new screw in he had to keep screwing down and backing out to get it to seat. He shot it this week and noticed the red dot was loose. He is thinking what ever loctite they used is what is keeping him from fully seating the screw. What gunsmith in the baton rouge area would you trust to chase these threads.