Here is a couple of short YouTube video's that a friend of mine made before and after of polishing the two parts of the B&A trigger that Alex Wheeler talks about doing.
Chet
https://youtube.com/shorts/qo_gyASjva0
https://youtube.com/shorts/JN2Z0w0Sj7M
Chet
https://youtube.com/shorts/qo_gyASjva0
https://youtube.com/shorts/JN2Z0w0Sj7M